H03F

AMPLIFIERS measuring, testing G01R; optical parametric amplifiers G02F; circuit arrangement with secondary emission tubes H01J43/30; masers, lasers H01S; control of amplification H03G; coupling arrangements independent of the nature of the amplifiers, voltage dividers H03H; amplifiers capable only of dealing with pulses H03K; repeater circuits in transmission lines H04B3/36, H04B3/58; application of speech amplifiers in telephonic communication H04M1/60, H04M3/40

This subclass covers:

linear amplification, there being linear relationship between the amplitudes of input and output, and the output having substantially the same waveform as the input;

dielectric amplifiers, magnetic amplifiers, and parametric amplifiers when used as oscillators or frequency-changers;

constructions of active elements of dielectric amplifiers and parametric amplifiers if no provision exists elsewhere.

The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following CPC groups:

H03F1/44

covered by

H03F1/42

H03F1/46

covered by

H03F1/42

H03F3/18

covered by

H03F3/00

H03F3/32

covered by

H03F3/30

H03F7/06

covered by

H03F7/00

In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.

H03F1/00

Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements

H03F1/02

Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation

H03F1/0205

in transistor amplifiers

H03F1/0211

with control of the supply voltage or current

H03F1/0216

Continuous control

H03F1/0222

by using a signal derived from the input signal

H03F1/0227

using supply converters

H03F1/0233

by using a signal derived from the output signal, e.g. bootstrapping the voltage supply

H03F1/0238

using supply converters

H03F1/0244

Stepped control

H03F1/025

by using a signal derived from the input signal

H03F1/0255

by using a signal derived from the output signal

H03F1/0261

with control of the polarisation voltage or current, e.g. gliding Class A

H03F1/0266

by using a signal derived from the input signal

H03F1/0272

by using a signal derived from the output signal

H03F1/0277

Selecting one or more amplifiers from a plurality of amplifiers

H03F1/0283

Reducing the number of Dc-current paths

H03F1/0288

using a main and one or several auxiliary peaking amplifiers whereby the load is connected to the main amplifier using an impedance inverter, e.g. Doherty amplifiers

H03F1/0294

using vector summing of two or more constant amplitude phase-modulated signals

H03F1/04

in discharge-tube amplifiers

H03F1/06

to raise the efficiency of amplifying modulated radio frequency waves

to raise the efficiency of amplifiers acting also as modulators

modulation H03C

H03F1/07

Doherty-type amplifiers

H03F1/08

Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements wide-band amplifiers with inter-stage coupling networks incorporating these impedances H03F1/42; eliminating transit-time effects in vacuum tubes H01J21/34

H03F1/083

in transistor amplifiers H03F1/10 - H03F1/22 take precedence

H03F1/086

with FET's

H03F1/10

by use of amplifying elements with multiple electrode connections

H03F1/12

by use of attenuating means

attenuators H03G

H03F1/13

in discharge tube amplifiers

H03F1/14

by use of neutralising means

H03F1/16

in discharge tube amplifiers

H03F1/18

by use of distributed coupling

, i.e. distributed amplifiers distributed amplifiers using coupling networks with distributed constants H03F3/605

H03F1/20

in discharge-tube amplifiers

H03F1/22

by use of cascode coupling, i.e. earthed cathode or emitter stage followed by earthed grid or base stage respectively

H03F1/223

with MOSFET's

H03F1/226

with junction-FET's

H03F1/24

in discharge-tube amplifiers

H03F1/26

Modifications of amplifiers to reduce influence of noise generated by amplifying elements

H03F1/28

in discharge-tube amplifiers

constructional modifications H01J23/11

H03F1/30

Modifications of amplifiers to reduce influence of variations of temperature or supply voltage

or other physical parameters in differential amplifiers H03F3/45479

H03F1/301

in MOSFET amplifiers H03F1/303, H03F1/305, H03F1/308 take precedence

H03F1/302

in bipolar transistor amplifiers H03F1/303, H03F1/305, H03F1/307 take precedence

H03F1/303

using a switching device H03F1/305, H03F3/005, H03F3/38 take precedence

H03F1/304

and using digital means

H03F1/305

in case of switching on or off of a power supply

H03F1/306

in junction-FET amplifiers H03F1/303, H03F1/305, H03F1/309 take precedence

H03F1/307

in push-pull amplifiers

H03F1/308

using MOSFET

H03F1/309

using junction-FET

H03F1/32

Modifications of amplifiers to reduce non-linear distortion by negative feedback H03F1/34

H03F1/3205

in field-effect transistor amplifiers

H03F1/3211

in differential amplifiers

H03F1/3217

in single ended push-pull amplifiers

H03F1/3223

using feed-forward H03F1/3211 takes precedence

H03F1/3229

using a loop for error extraction and another loop for error subtraction

H03F1/3235

using a pilot signal

H03F1/3241

using predistortion circuits H03F1/3211, H03F1/3217 take precedence

H03F1/3247

using feedback acting on predistortion circuits H03F1/3264 takes precedence

H03F1/3252

using multiple parallel paths between input and output H03F1/3258, H03F1/3282, H03F1/3294 take precedence

H03F1/3258

based on polynomial terms

H03F1/3264

in audio amplifiers

H03F1/327

to emulate discharge tube amplifier characteristics

H03F1/3276

using the nonlinearity inherent to components, e.g. a diode

H03F1/3282

Acting on the phase and the amplitude of the input signal

H03F1/3288

to compensate phase shift as a function of the amplitude

H03F1/3294

Acting on the real and imaginary components of the input signal

H03F1/33

in discharge-tube amplifiers

H03F1/34

Negative-feedback-circuit arrangements with or without positive feedback H03F1/02 - H03F1/30, H03F1/38 - H03F1/50, H03F3/50 take precedence;

for rejection of common mode signals H03F3/45479

H03F1/342

in field-effect transistor amplifiers

H03F1/345

using hybrid or directional couplers

H03F1/347

using transformers

H03F1/36

in discharge-tube amplifiers

H03F1/38

Positive-feedback circuit arrangements without negative feedback

H03F1/40

in discharge-tube amplifiers

H03F1/42

Modifications of amplifiers to extend the bandwidth

H03F1/48

of aperiodic amplifiers

H03F1/483

with field-effect transistors

H03F1/486

with IC amplifier blocks

H03F1/50

with tubes only

H03F1/52

Circuit arrangements for protecting such amplifiers

monitoring arrangements G01R31/28; increasing reliability in communication systems, e.g. using redundancy H04B1/74

H03F1/523

for amplifiers using field-effect devices H03F1/526 takes precedence

H03F1/526

protecting by using redundant amplifiers

H03F1/54

with tubes only

testing of vacuum tubes G01R31/25

H03F1/542

Replacing by standby devices

H03F1/544

Protection of filaments

H03F1/546

Delaying application of anode power supply with respect to application of filament heating power supply

H03F1/548

Protection of anode or grid circuit against overload

H03F1/56

Modifications of input or output impedances, not otherwise provided for

H03F1/565

using inductive elements

H03F3/00

Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements

Groups H03F3/20 - H03F3/72 take precedence over groups H03F3/02 - H03F3/189.

This Note corresponds to IPC Note (1) relating to H03F3/02 - H03F3/189.

H03F3/005

using switched capacitors, e.g. dynamic amplifiers; using switched capacitors as resistors in differential amplifiers H03F3/45 takes precedence

H03F3/02

with tubes only subsequent sub-groups take precedence

H03F3/04

with semiconductor devices only subsequent sub-groups take precedence

H03F3/06

using hole storage effect

H03F3/08

controlled by light

H03F3/082

with FET's H03F3/085 takes precedence

H03F3/085

using opto-couplers between stages

H03F3/087

with IC amplifier blocks H03F3/085 takes precedence

H03F3/10

with diodes

parametric amplifiers H03F7/00

H03F3/12

with Esaki diodes

H03F3/14

with amplifying devices having more than three electrodes or more than two PN junctions

H03F3/16

with field-effect devices

H03F3/165

with junction-FET's

H03F3/181

Low frequency amplifiers, e.g. audio preamplifiers

H03F3/183

with semiconductor devices only

H03F3/185

with field-effect devices H03F3/187 takes precedence

H03F3/1855

with junction-FET devices

H03F3/187

in integrated circuits

H03F3/189

High frequency amplifiers, e.g. radio frequency amplifiers

H03F3/19

with semiconductor devices only

H03F3/191

Tuned amplifiers H03F3/193, H03F3/195 take precedence

H03F3/193

with field-effect devices H03F3/195 takes precedence

H03F3/1935

with junction-FET devices

H03F3/195

in integrated circuits

H03F3/20

Power amplifiers, e.g. Class B amplifiers, Class C amplifiers H03F3/26 - H03F3/30 take precedence

H03F3/21

with semiconductor devices only

H03F3/245 takes precedence

H03F3/211

using a combination of several amplifiers H03F3/60 takes precedence

H03F3/213

in integrated circuits

H03F3/217

Class D power amplifiers

Switching amplifiers

H03F3/2171

with field-effect devices H03F3/2173 - H03F3/2178 take precedence

H03F3/2173

of the bridge type

H03F3/2175

using analogue-digital or digital-analogue conversion H03F3/2173 takes precedence

H03F3/2176

Class E amplifiers

H03F3/2178

using more than one switch or switching amplifier in parallel or in series H03F3/2173, H03F3/2175 take precedence

H03F3/22

with tubes only H03F3/24 takes precedence

H03F3/24

of transmitter output stages

H03F3/245

with semiconductor devices only

H03F3/26

Push-pull amplifiers

Phase-splitters therefor duplicated single-ended push-pull arrangements or phase-splitters therefor H03F3/30

H03F3/265

with field-effect transistors only

H03F3/28

with tubes only

H03F3/30

Single-ended push-pull

[SEPP]

amplifiers

single-ended sense amplifiers G11C7/067

Phase-splitters therefor

H03F3/3001

with field-effect transistors

H03F3/3008

Bifet SEPP output stages

H03F3/301

CMOS common drain output SEPP amplifiers H03F3/3008 takes precedence

H03F3/3011

with asymmetrical driving of the end stage

H03F3/3013

using a common drain driving stage, i.e. follower stage

H03F3/3015

using a common source driving stage, i.e. inverting stage

H03F3/3016

with symmetrical driving of the end stage

H03F3/3018

using opamps as driving stages

H03F3/302

using two SEPP driving stages

H03F3/3022

CMOS common source output SEPP amplifiers H03F3/3008 takes precedence

H03F3/3023

with asymmetrical driving of the end stage

H03F3/3025

using a common drain driving stage, i.e. follower stage

H03F3/3027

using a common source driving stage, i.e. inverting stage

H03F3/3028

with symmetrical driving of the end stage

H03F3/303

using opamps as driving stages

H03F3/3032

using two SEPP driving stages

H03F3/3033

NMOS SEPP output stages H03F3/3008 takes precedence

H03F3/3035

using differential amplifiers as phase-splitting elements

H03F3/3037

with asymmetric control, i.e. one control branch containing a supplementary phase inverting stage

H03F3/3038

PMOS SEPP output stages H03F3/3008 takes precedence

H03F3/304

using differential amplifiers as phase-splitting element

H03F3/3042

with asymmetric control, i.e. one control branch containing a supplementary phase inverting stage

H03F3/3044

Junction FET SEPP output stages H03F3/3008 takes precedence

H03F3/3045

with asymmetrical driving of the end stage

H03F3/3047

using a common drain driving stage, i.e. follower stage

H03F3/3049

using a common source driving stage, i.e. inverting stage

H03F3/305

with symmetrical driving of the end stage

H03F3/3052

using opamps as driving stages

H03F3/3054

using two SEPP driving stages

H03F3/3055

Parallelled mixed SEPP stages, e.g. a CMOS common drain and a CMOS common source in parallel or bipolar SEPP and FET SEPP in parallel

H03F3/3057

with asymmetrical driving of the end stage

H03F3/3059

with symmetrical driving of the end stage

H03F3/3061

Bridge type, i.e. two complementary controlled SEPP output stages

H03F3/3062

with asymmetrical driving of the end stage

H03F3/3064

with symmetrical driving of the end stage

H03F3/3066

the collectors of complementary power transistors being connected to the output

H03F3/3067

with asymmetrical driving of the end stage

H03F3/3069

the emitters of complementary power transistors being connected to the output

H03F3/3071

with asymmetrical driving of the end stage

H03F3/3072

using Darlington transistors H03F3/3074 takes precedence

H03F3/3074

using parallel power transistors

H03F3/3076

with symmetrical driving of the end stage

H03F3/3077

using Darlington transistors H03F3/3079 takes precedence

H03F3/3079

using parallel power transistors

H03F3/3081

Duplicated single-ended push-pull arrangements, i.e. bridge circuits using FET's H03F3/3061

H03F3/3083

the power transistors being of the same type H03F3/3001 takes precedence

H03F3/3084

one of the power transistors being controlled by the output signal

H03F3/3086

two power transistors being controlled by the input signal

H03F3/3088

with asymmetric control, i.e. one control branch containing a supplementary phase inverting transistor

H03F3/3089

comprising field-effect transistors in the control circuit

H03F3/3091

comprising two complementary transistors for phase-splitting

H03F3/3093

comprising a differential amplifier as phase-splitting element

H03F3/3094

Phase splitters therefor H03F3/3088, H03F3/3091, H03F3/3093, H03F3/3096, H03F3/3098 take precedence

H03F3/3096

using a single transistor with output on emitter and collector as phase splitter

H03F3/3098

using a transformer as phase splitter

H03F3/34

Dc amplifiers in which all stages are dc-coupled H03F3/45 takes precedence

H03F3/343

with semiconductor devices only

H03F3/3432

with bipolar transistors

H03F3/3435

using Darlington amplifiers

H03F3/3437

with complementary transistors

H03F3/345

with field-effect devices H03F3/347 takes precedence

H03F3/3455

with junction-FET's

H03F3/347

in integrated circuits

H03F3/36

with tubes only

H03F3/38

Dc amplifiers with modulator at input and demodulator at output

Modulators or demodulators specially adapted for use in such amplifiers

switched capacitor amplifiers H03F3/005

; modulators in general H03C; demodulators in general H03D; amplitude modulation of pulses in general H03K7/02; amplitude demodulation of pulses in general H03K9/02

H03F3/387

with semiconductor devices only

H03F3/393

with field-effect devices

H03F3/40

with tubes only

H03F3/42

Amplifiers with two or more amplifying elements having their dc paths in series with the load, the control electrode of each element being excited by at least part of the input signal, e.g. so-called totem-pole amplifiers

H03F3/423

with MOSFET's

H03F3/426

with junction-FET's

H03F3/44

with tubes only

H03F3/45

Differential amplifiers differential sense amplifiers G11C7/062

H03F3/45071

with semiconductor devices only

H03F3/45076

characterised by the way of implementation of the active amplifying circuit in the differential amplifier

H03F3/4508

using bipolar transistors as the active amplifying circuit H03F3/45278 takes precedence

H03F3/45085

Long tailed pairs H03F3/45112, H03F3/45139 take precedence

H03F3/45089

Non-folded cascode stages

H03F3/45094

Folded cascode stages

H03F3/45098

PI types H03F3/45125, H03F3/45152 take precedence

H03F3/45103

Non-folded cascode stages

H03F3/45107

Folded cascode stages

H03F3/45112

Complementary long tailed pairs having parallel inputs and being supplied in parallel

H03F3/45116

Non-folded cascode stages

H03F3/45121

Folded cascode stages

H03F3/45125

Complementary PI types having parallel inputs and being supplied in parallel

H03F3/4513

Non-folded cascode stages

H03F3/45134

Folded cascode stages

H03F3/45139

Complementary long tailed pairs having parallel inputs and being supplied in series

H03F3/45143

Non-folded cascode stages

H03F3/45147

Folded cascode stages

H03F3/45152

Complementary PI types having parallel inputs and being supplied in series

H03F3/45156

Non-folded cascode stages

H03F3/45161

Folded cascode stages

H03F3/45165

Complementary cross coupled types

H03F3/4517

Complementary non-cross coupled types

H03F3/45174

Mirror types

H03F3/45179

using MOSFET transistors as the active amplifying circuit H03F3/45278 takes precedence

H03F3/45183

Long tailed pairs H03F3/4521, H03F3/45237 take precedence

H03F3/45188

Non-folded cascode stages

H03F3/45192

Folded cascode stages

H03F3/45197

Pl types H03F3/45224, H03F3/45251 take precedence

H03F3/45201

Non-folded cascode stages

H03F3/45206

Folded cascode stages

H03F3/4521

Complementary long tailed pairs having parallel inputs and being supplied in parallel

H03F3/45215

Non-folded cascode stages

H03F3/45219

Folded cascode stages

H03F3/45224

Complementary Pl types having parallel inputs and being supplied in parallel

H03F3/45228

Non-folded cascode stages

H03F3/45233

Folded cascode stages

H03F3/45237

Complementary long tailed pairs having parallel inputs and being supplied in series

H03F3/45242

Non-folded cascode stages

H03F3/45246

Folded cascode stages

H03F3/45251

Complementary Pl types having parallel inputs and being supplied in series

H03F3/45255

Non-folded cascode stages

H03F3/4526

Folded cascode stages

H03F3/45264

Complementary cross coupled types

H03F3/45269

Complementary non-cross coupled types

H03F3/45273

Mirror types

H03F3/45278

using BiFET transistors as the active amplifying circuit

H03F3/45282

Long tailed pairs H03F3/45309, H03F3/45336 take precedence

H03F3/45286

Non-folded cascode stages

H03F3/45291

Folded cascode stages

H03F3/45295

Pl types H03F3/45322, H03F3/45349 take precedence

H03F3/453

Non-folded cascode stages

H03F3/45304

Folded cascode stages

H03F3/45309

Complementary long tailed pairs having parallel inputs and being supplied in parallel

H03F3/45313

Non-folded cascode stages

H03F3/45318

Folded cascode stages

H03F3/45322

Complementary Pl types having parallel inputs and being supplied in parallel

H03F3/45327

Non-folded cascode stages

H03F3/45331

Folded cascode stages

H03F3/45336

Complementary long tailed pairs having parallel inputs and being supplied in series

H03F3/4534

Non-folded cascode stages

H03F3/45345

Folded cascode stages

H03F3/45349

Complementary Pl types having parallel inputs and being supplied in series

H03F3/45354

Non-folded cascode stages

H03F3/45358

Folded cascode stages

H03F3/45363

Complementary cross coupled types

H03F3/45367

Complementary non-cross coupled types

H03F3/45372

Mirror types

H03F3/45376

using junction FET transistors as the active amplifying circuit H03F3/45278 takes precedence

H03F3/45381

Long tailed pairs H03F3/45408, H03F3/45434 take precedence

H03F3/45385

Non-folded cascode stages

H03F3/4539

Folded cascode stages

H03F3/45394

Pl types H03F3/45421, H03F3/45448 take precedence

H03F3/45399

Non-folded cascode stages

H03F3/45403

Folded cascode stages

H03F3/45408

Complementary long tailed pairs having parallel inputs and being supplied in parallel

H03F3/45412

Non-folded cascode stages

H03F3/45417

Folded cascode stages

H03F3/45421

Complementary Pl types having parallel inputs and being supplied in parallel

H03F3/45426

Non-folded cascode stages

H03F3/4543

Folded cascode stages

H03F3/45434

Complementary long tailed pairs having parallel inputs and being supplied in series

H03F3/45439

Non-folded cascode stages

H03F3/45443

Folded cascode stages

H03F3/45448

Complementary Pl types having parallel inputs and being supplied in series

H03F3/45452

Non-folded cascode stages

H03F3/45457

Folded cascode stages

H03F3/45461

Complementary cross coupled types

H03F3/45466

Complementary non-cross coupled types

H03F3/4547

Mirror types

H03F3/45475

using IC blocks as the active amplifying circuit

H03F3/45479

characterised by the way of common mode signal rejection

H03F3/45484

in differential amplifiers with bipolar transistors as the active amplifying circuit H03F3/4578 takes precedence

H03F3/45488

by using feedback means H03F3/4578 takes precedence

H03F3/45493

Measuring at the loading circuit of the differential amplifier

H03F3/45497

Controlling the input circuit of the differential amplifier

H03F3/45502

Controlling the common emitter circuit of the differential amplifier

H03F3/45506

Controlling the active amplifying circuit of the differential amplifier

H03F3/45511

Controlling the loading circuit of the differential amplifier

H03F3/45515

Measuring at the active amplifying circuit of the differential amplifier

H03F3/4552

Controlling the input circuit of the differential amplifier

H03F3/45524

Controlling the common emitter circuit of the differential amplifier

H03F3/45529

Controlling the active amplifying circuit of the differential amplifier

H03F3/45533

Measuring at the common emitter circuit of the differential amplifier

H03F3/45538

Controlling the input circuit of the differential amplifier

H03F3/45542

Controlling the common emitter circuit of the differential amplifier

H03F3/45547

by using feedforward means H03F3/45596 takes precedence

H03F3/45551

Measuring at the input circuit of the differential amplifier

H03F3/45556

Controlling the input circuit of the differential amplifier

H03F3/4556

Controlling the common emitter circuit of the differential amplifier

H03F3/45565

Controlling the active amplifying circuit of the differential amplifier

H03F3/45569

Controlling the loading circuit of the differential amplifier

H03F3/45573

Measuring at the active amplifying circuit of the differential amplifier

H03F3/45578

Controlling the loading circuit of the differential amplifier

H03F3/45582

Measuring at the common emitter circuit of the differential amplifier

H03F3/45587

Controlling the active amplifying circuit of the differential amplifier

H03F3/45591

Controlling the loading circuit of the differential amplifier

H03F3/45596

by offset reduction

H03F3/456

by using a feedback circuit

H03F3/45605

using switching means, e.g. sample and hold

H03F3/45609

by using a feedforward circuit

H03F3/45614

using switching means, e.g. sample and hold

H03F3/45618

by using balancing means

H03F3/45623

using switching means

H03F3/45627

by using cross switches

H03F3/45632

in differential amplifiers with FET transistors as the active amplifying circuit H03F3/4578 takes precedence

H03F3/45636

by using feedback means H03F3/45744 takes precedence

H03F3/45641

Measuring at the loading circuit of the differential amplifier

H03F3/45645

Controlling the input circuit of the differential amplifier

H03F3/4565

Controlling the common source circuit of the differential amplifier

H03F3/45654

Controlling the active amplifying circuit of the differential amplifier

H03F3/45659

Controlling the loading circuit of the differential amplifier

H03F3/45663

Measuring at the active amplifying circuit of the differential amplifier

H03F3/45668

Controlling the input circuit of the differential amplifier

H03F3/45672

Controlling the common source circuit of the differential amplifier

H03F3/45677

Controlling the active amplifying circuit of the differential amplifier

H03F3/45681

Measuring at the common source circuit of the differential amplifier

H03F3/45686

Controlling the input circuit of the differential amplifier

H03F3/4569

Controlling the common source circuit of the differential amplifier

H03F3/45695

by using feedforward means H03F3/45744 takes precedence

H03F3/45699

Measuring at the input circuit of the differential amplifier

H03F3/45704

Controlling the input circuit of the differential amplifier

H03F3/45708

Controlling the common source circuit of the differential amplifier

H03F3/45713

Controlling the active amplifying circuit of the differential amplifier

H03F3/45717

Controlling the loading circuit of the differential amplifier

H03F3/45721

Measuring at the active amplifying circuit of the differential amplifier

H03F3/45726

Controlling the loading circuit of the differential amplifier

H03F3/4573

Measuring at the common source circuit of the differential amplifier

H03F3/45735

Controlling the active amplifying circuit of the differential amplifier

H03F3/45739

Controlling the loading circuit of the differential amplifier

H03F3/45744

by offset reduction

H03F3/45748

by using a feedback circuit

H03F3/45753

using switching means, e.g. sample and hold

H03F3/45757

by using a feedforward circuit

H03F3/45762

using switching means, e.g. sample and hold

H03F3/45766

by using balancing means

H03F3/45771

using switching means

H03F3/45775

by using cross switches

H03F3/4578

in differential amplifiers with BiFET transistors as the active amplifying circuit

H03F3/45784

by using feedback means H03F3/45892 takes precedence

H03F3/45789

Measuring at the loading circuit of the differential amplifier

H03F3/45793

Controlling the input circuit of the differential amplifier

H03F3/45798

Controlling the common source circuit of the differential amplifier

H03F3/45802

Controlling the active amplifying circuit of the differential amplifier

H03F3/45807

Controlling the loading circuit of the differential amplifier

H03F3/45811

Measuring at the active amplifying circuit of the differential amplifier

H03F3/45816

Controlling the input circuit of the differential amplifier

H03F3/4582

Controlling the common source circuit of the differential amplifier

H03F3/45825

Controlling the active amplifying circuit of the differential amplifier

H03F3/45829

Measuring at the common source circuit of the differential amplifier

H03F3/45834

Controlling the input circuit of the differential amplifier

H03F3/45838

Controlling the common source circuit of the differential amplifier

H03F3/45843

by using feedforward means H03F3/45892 takes precedence

H03F3/45847

Measuring at the input circuit of the differential amplifier

H03F3/45852

Controlling the input circuit of the differential amplifier

H03F3/45856

Controlling the common source circuit of the differential amplifier

H03F3/4586

Controlling the active amplifying circuit of the differential amplifier

H03F3/45865

Controlling the loading circuit of the differential amplifier

H03F3/45869

Measuring at the active amplifying circuit of the differential amplifier

H03F3/45874

Controlling the loading circuit of the differential amplifier

H03F3/45878

Measuring at the common source circuit of the differential amplifier

H03F3/45883

Controlling the active amplifying circuit of the differential amplifier

H03F3/45887

Controlling the loading circuit of the differential amplifier

H03F3/45892

by offset reduction

H03F3/45896

by using a feedback circuit

H03F3/45901

using switching means, e.g. sample and hold

H03F3/45905

by using a feedforward circuit

H03F3/4591

using switching means, e.g. sample and hold

H03F3/45914

by using balancing means

H03F3/45919

using switching means

H03F3/45923

by using cross switches

H03F3/45928

using IC blocks as the active amplifying circuit

H03F3/45932

by using feedback means H03F3/45968 takes precedence

H03F3/45937

Measuring at the loading circuit of the differential amplifier

H03F3/45941

Controlling the input circuit of the differential amplifier

H03F3/45946

Controlling the loading circuit of the differential amplifier

H03F3/4595

by using feedforward means H03F3/45968 takes precedence

H03F3/45955

Measuring at the input circuit of the differential amplifier

H03F3/45959

Controlling the input circuit of the differential amplifier

H03F3/45964

Controlling the loading circuit of the differential amplifier

H03F3/45968

by offset reduction

H03F3/45973

by using a feedback circuit

H03F3/45977

using switching means, e.g. sample and hold

H03F3/45982

by using a feedforward circuit

H03F3/45986

using switching means, e.g. sample and hold

H03F3/45991

by using balancing means

H03F3/45995

using switching means

H03F3/46

Reflex amplifiers

reflection amplifiers H03F3/608

H03F3/48

with tubes only

H03F3/50

Amplifiers in which input is applied to, or output is derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower

H03F3/505

with field-effect devices

H03F3/52

with tubes only

H03F3/54

Amplifiers using transit-time effect in tubes or semiconductor devices parametric amplifiers H03F7/00; solid state travelling-wave devices H10N70/10

H03F3/55

with semiconductor devices only

H03F3/56

using klystrons

H03F3/58

using travelling-wave tubes

H03F3/60

Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators H03F3/54 takes precedence

H03F3/601

using FET's, e.g. GaAs FET's H03F3/607, H03F3/608 take precedence

H03F3/602

Combinations of several amplifiers

H03F3/604

using FET's

H03F3/605

Distributed amplifiers

H03F3/607

using FET's

H03F3/608

Reflection amplifiers, i.e. amplifiers using a one-port amplifying element and a multiport coupler H03F7/00 takes precedence

H03F3/62

Two-way amplifiers

H03F3/64

with tubes only

H03F3/66

Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency

H03F3/68

Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics

power amplifiers using a combination of several semiconductor amplifiers H03F3/211; combinations of amplifiers using coupling networks with distributed constants H03F3/602

H03F3/70

Charge amplifiers

H03F3/72

Gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal

H03F5/00

Amplifiers with both discharge tubes and semiconductor devices as amplifying elements

H03F7/00

Parametric amplifiers

H03F19/00 takes precedence

; devices or arrangements for the parametric generation or amplification of light, infra-red or ultra-violet waves G02F1/39

H03F7/02

using variable-inductance element

using variable-permeability element

H03F7/04

using variable-capacitance element

using variable-permittivity element

H03F9/00

Magnetic amplifiers

H03F9/02

current-controlled, i.e. the load current flowing in both directions through a main coil

H03F9/04

voltage-controlled, i.e. the load current flowing in only one direction through a main coil, e.g. Logan circuits H03F9/06 takes precedence

H03F9/06

Control by voltage time integral, i.e. the load current flowing in only one direction through a main coil, whereby the main coil winding also can be used as a control winding, e.g. Ramey circuits

H03F11/00

Dielectric amplifiers

H03F13/00

Amplifiers using amplifying element consisting of two mechanically- or acoustically-coupled transducers, e.g. telephone-microphone amplifier

H03F15/00

Amplifiers using galvano-magnetic effects not involving mechanical movement, e.g. using Hall effect

H03F17/00

Amplifiers using electroluminescent element or photocell

H03F19/00

Amplifiers using superconductivity effects

H03F99/00

Subject matter not provided for in other groups of this subclass

H03F2200/00

Indexing scheme relating to amplifiers

H03F2200/03

the amplifier being designed for audio applications

H03F2200/06

A balun, i.e. balanced to or from unbalanced converter, being present at the input of an amplifier

H03F2200/09

A balun, i.e. balanced to or from unbalanced converter, being present at the output of an amplifier

H03F2200/102

A non-specified detector of a signal envelope being used in an amplifying circuit

H03F2200/105

A non-specified detector of the power of a signal being used in an amplifying circuit

H03F2200/108

A coil being added in the drain circuit of a FET amplifier stage, e.g. for noise reducing purposes

H03F2200/111

the amplifier being a dual or triple band amplifier, e.g. 900 and 1800 MHz, e.g. switched or not switched, simultaneously or not

H03F2200/114

the amplifier comprising means for electro-magnetic interference [EMI] protection

H03F2200/117

A coil being coupled in a feedback path of an amplifier stage

H03F2200/12

A bias circuit for some stages being shown using transmission lines

H03F2200/121

A transistor in common gate configuration being used in a feedback circuit of an amplifier stage

H03F2200/123

A difference signal between an output and an input signal of an amplifier being coupled back at the input of the amplifier

H03F2200/126

A diode being coupled in a feedback path of an amplifier stage, e.g. active or passive diode

H03F2200/129

there being a feedback over the complete amplifier

H03F2200/132

Hybrid coupler placed in a feedback circuit of an amplifier

H03F2200/135

there being a feedback over one or more internal stages in the global amplifier

H03F2200/138

the feedback circuit comprising a parallel resonance circuit

H03F2200/141

the feedback circuit of the amplifier stage comprising a resistor and a capacitor in series, at least one of them being an active one

H03F2200/144

the feedback circuit of the amplifier stage comprising a passive resistor and passive capacitor

H03F2200/147

the feedback circuit comprising a series resonance circuit

H03F2200/15

the supply or bias voltage or current at the drain side of a FET being continuously controlled by a controlling signal

H03F2200/151

A source follower being used in a feedback circuit of an amplifier stage

H03F2200/153

Feedback used to stabilise the amplifier

H03F2200/156

One or more switches are realised in the feedback circuit of the amplifier stage

H03F2200/159

the feedback circuit being closed during a switching time

H03F2200/162

FETs are biased in the weak inversion region

H03F2200/165

A filter circuit coupled to the input of an amplifier

H03F2200/168

Two amplifying stages are coupled by means of a filter circuit

H03F2200/171

A filter circuit coupled to the output of an amplifier

H03F2200/174

Floating gate implemented in MOS technology

H03F2200/177

Folded cascode realised by a folding coil

H03F2200/18

the bias of the gate of a FET being controlled by a control signal

H03F2200/181

A coil being added in the gate circuit of a FET amplifier stage, e.g. for noise reducing purposes

H03F2200/183

the amplifier comprising a gated diode

H03F2200/186

the ground, reference potential being controlled

H03F2200/189

the ground, reference or shield potential difference between different chips being controlled

H03F2200/192

A hybrid coupler being used at the input of an amplifier circuit

H03F2200/195

A hybrid coupler being used as power measuring circuit at the input of an amplifier circuit

H03F2200/198

A hybrid coupler being used as coupling circuit between stages of an amplifier circuit

H03F2200/201

A hybrid coupler being used as power measuring inter-stage circuit between two stages of an amplifier circuit

H03F2200/204

A hybrid coupler being used at the output of an amplifier circuit

H03F2200/207

A hybrid coupler being used as power measuring circuit at the output of an amplifier circuit

H03F2200/21

Bias resistors are added at the input of an amplifier

H03F2200/211

the input of an amplifier can be attenuated by a continuously controlled transistor attenuator

H03F2200/213

A variable capacitor being added in the input circuit, e.g. base, gate, of an amplifier stage

H03F2200/216

A coil being added in the input circuit, e.g. base, gate, of an amplifier stage

H03F2200/219

Follower transistors are added at the input of the amplifier, e.g. source or emitter followers

H03F2200/222

A circuit being added at the input of an amplifier to adapt the input impedance of the amplifier

H03F2200/225

the input circuit of an amplifying stage comprising an LC-network

H03F2200/228

A measuring circuit being coupled to the input of an amplifier

H03F2200/231

the input of an amplifier can be switched on or off by a switch to amplify or not an input signal

H03F2200/234

the input amplifying stage being one or more operational amplifiers

H03F2200/237

A parallel resonance being added in series in the input circuit, e.g. base, gate, of an amplifier stage

H03F2200/24

the supply or bias voltage or current at the source side of a FET being continuously controlled by a controlling signal

H03F2200/241

A parallel resonance being added in shunt in the input circuit, e.g. base, gate, of an amplifier stage

H03F2200/243

A series resonance being added in series in the input circuit, e.g. base, gate, of an amplifier stage

H03F2200/246

A series resonance being added in shunt in the input circuit, e.g. base, gate, of an amplifier stage, e.g. as a trap

H03F2200/249

A switch coupled in the input circuit of an amplifier being controlled by a circuit, e.g. feedback circuitry being controlling the switch

H03F2200/252

Multiple switches coupled in the input circuit of an amplifier are controlled by a circuit, e.g. feedback circuitry being controlling the switch

H03F2200/255

Amplifier input adaptation especially for transmission line coupling purposes, e.g. impedance adaptation

H03F2200/258

the input of the amplifier has voltage limiting means

H03F2200/261

Amplifier which being suitable for instrumentation applications

H03F2200/264

An operational amplifier based integrator or transistor based integrator being used in an amplifying circuit

H03F2200/267

A capacitor based passive circuit, e.g. filter, being used in an amplifying circuit

H03F2200/27

A biasing circuit node being switched in an amplifier circuit

H03F2200/271

the DC-isolation amplifier, e.g. chopper amplifier, modulation/demodulation amplifier, uses capacitive isolation means, e.g. capacitors

H03F2200/273

the DC-isolation amplifier, e.g. chopper amplifier, modulation/demodulation amplifier, uses inductive isolation means, e.g. transformers

H03F2200/276

the DC-isolation amplifier, e.g. chopper amplifier, modulation/demodulation amplifier, uses optical isolation means, e.g. optical couplers

H03F2200/279

the level shifting stage between two amplifying stages being realised by an explicit differential amplifier

H03F2200/282

the level shifting stage between two amplifying stages being realised by a diode

H03F2200/285

the level shifting stage between two amplifying stages being realised by an emitter follower

H03F2200/288

the level shifting stage between two amplifying stages being realised by a resistor or potentiometer

H03F2200/291

the level shifting stage between two amplifying stages being realised by a source follower

H03F2200/294

the amplifier being a low noise amplifier [LNA]

H03F2200/297

the loading circuit of an amplifying stage comprising a capacitor

H03F2200/301

the loading circuit of an amplifying stage comprising a coil

H03F2200/303

the loading circuit of an amplifying stage comprising a diode or diode coupled transistor

H03F2200/306

the loading circuit of an amplifying stage being a parallel resonance circuit

H03F2200/309

the loading circuit of an amplifying stage being a series resonance circuit

H03F2200/31

the switching power stage comprising circuitry for emulating the behaviour of a bootstrap diode

H03F2200/312

the loading circuit of an amplifying stage comprising one or more switches

H03F2200/315

the loading circuit of an amplifying stage comprising a transmission line

H03F2200/318

A matching circuit being used as coupling element between two amplifying stages

H03F2200/321

Use of a microprocessor in an amplifier circuit or its control circuit

H03F2200/324

An amplitude modulator or demodulator being used in the amplifier circuit

H03F2200/327

Amplitude shift keying modulation being used in an amplifying circuit

H03F2200/33

Bridge form coupled amplifiers

H-form coupled amplifiers

H03F2200/331

Sigma delta modulation being used in an amplifying circuit

H03F2200/333

A frequency modulator or demodulator being used in the amplifier circuit

H03F2200/336

A I/Q, i.e. phase quadrature, modulator or demodulator being used in an amplifying circuit

H03F2200/339

Pulse amplitude modulation being used in an amplifying circuit

H03F2200/342

Pulse code modulation being used in an amplifying circuit

H03F2200/345

Pulse density modulation being used in an amplifying circuit

H03F2200/348

Pulse frequency modulation being used in an amplifying circuit

H03F2200/351

Pulse width modulation being used in an amplifying circuit

H03F2200/354

the amplifier comprising MOS which are biased in the moderate inversion region

H03F2200/357

the amplifier comprising MOS which are biased in the weak inversion region

H03F2200/36

the amplifier comprising means for increasing the bandwidth

H03F2200/361

Transistor with multiple collectors

H03F2200/363

Transistor with multiple emitters

H03F2200/366

Multiple MOSFETs are coupled in parallel

H03F2200/369

A negative impedance circuit being added to an amplifier circuit

H03F2200/372

Noise reduction and elimination in amplifier

H03F2200/375

Circuitry to compensate the offset being present in an amplifier

H03F2200/378

A variable capacitor being added in the output circuit, e.g. collector, drain, of an amplifier stage

H03F2200/381

An active variable resistor, e.g. controlled transistor, being coupled in the output circuit of an amplifier to control the output

H03F2200/384

Amplifier without output filter, i.e. directly connected to the load

H03F2200/387

A circuit being added at the output of an amplifier to adapt the output impedance of the amplifier

H03F2200/39

Different band amplifiers are coupled in parallel to broadband the whole amplifying circuit

H03F2200/391

the output circuit of an amplifying stage comprising an LC-network

H03F2200/393

A measuring circuit being coupled to the output of an amplifier

H03F2200/396

the output of an amplifier can be switched on or off by a switch to couple the output signal to a load

H03F2200/399

A parallel resonance being added in shunt in the output circuit, e.g. base, gate, of an amplifier stage

H03F2200/402

A series resonance being added in shunt in the output circuit, e.g. base, gate, of an amplifier stage

H03F2200/405

the output amplifying stage of an amplifier comprising more than three power stages

H03F2200/408

the output amplifying stage of an amplifier comprising three power stages

H03F2200/411

the output amplifying stage of an amplifier comprising two power stages

H03F2200/414

A switch being coupled in the output circuit of an amplifier to switch the output on/off

H03F2200/417

A switch coupled in the output circuit of an amplifier being controlled by a circuit

H03F2200/42

the input to the amplifier being made by capacitive coupling means

H03F2200/421

Multiple switches coupled in the output circuit of an amplifier are controlled by a circuit

H03F2200/423

Amplifier output adaptation especially for transmission line coupling purposes, e.g. impedance adaptation

H03F2200/426

the amplifier comprising circuitry for protection against overload

H03F2200/429

Two or more amplifiers or one amplifier with filters for different frequency bands are coupled in parallel at the input or output

H03F2200/432

Two or more amplifiers of different type are coupled in parallel at the input or output, e.g. a class D and a linear amplifier, a class B and a class A amplifier

H03F2200/435

A peak detection being used in a signal measuring circuit in a controlling circuit of an amplifier

H03F2200/438

Separate feedback of amplitude and phase signals being present

H03F2200/441

Protection of an amplifier being implemented by clamping means

H03F2200/444

Diode used as protection means in an amplifier, e.g. as a limiter or as a switch

H03F2200/447

the amplifier being protected to temperature influence

H03F2200/45

the load of the amplifier being a capacitive element, e.g. CRT

H03F2200/451

the amplifier being a radio frequency amplifier

H03F2200/453

Controlling being realised by adding a replica circuit or by using one among multiple identical circuits as a replica circuit

H03F2200/456

A scaled replica of a transistor being present in an amplifier

H03F2200/459

Ripple reduction circuitry being used in an amplifying circuit

H03F2200/462

the current being sensed

H03F2200/465

Power sensing

H03F2200/468

the temperature being sensed

H03F2200/471

the voltage being sensed

H03F2200/474

A current mirror being used as sensor

H03F2200/477

Paralleled transistors are used as sensors

H03F2200/48

the output of the amplifier being coupled out by a capacitor

H03F2200/481

A resistor being used as sensor

H03F2200/483

A shunting switch being paralleled to the sensor

H03F2200/486

the current in the load of an amplifying stage being sensed by a torus

H03F2200/489

A coil being added in the source circuit of a common source stage, e.g. as degeneration means

H03F2200/492

A coil being added in the source circuit of a transistor amplifier stage as degenerating element

H03F2200/495

A parallel resonance circuit being added in the source circuit of a FET amplifier

H03F2200/498

A resistor being added in the source circuit of a transistor amplifier stage as degenerating element

H03F2200/501

A series resonance circuit being added in the source circuit of a FET amplifier

H03F2200/504

the supply voltage or current being continuously controlled by a controlling signal, e.g. the controlling signal of a transistor implemented as variable resistor in a supply path for, an IC-block showed amplifier

H03F2200/507

A switch being used for switching on or off a supply or supplying circuit in an IC-block amplifier circuit

H03F2200/51

Capacitor in positive feedback circuit of an amplifier circuit to bootstrap a resistor

H03F2200/511

Many discrete supply voltages or currents or voltage levels can be chosen by a control signal in an IC-block amplifier circuit

H03F2200/513

the amplifier being made for low supply voltages

H03F2200/516

Some amplifier stages of an amplifier use supply voltages of different value

H03F2200/519

the bias or supply voltage or current of the drain side of a FET amplifier being controlled to be on or off by a switch

H03F2200/522

the bias or supply voltage or current of the gate side of a FET amplifier being controlled to be on or off by a switch

H03F2200/525

the bias or supply voltage or current of the source side of a FET amplifier being controlled to be on or off by a switch

H03F2200/528

the temperature dependence being controlled by referencing to the band gap

H03F2200/531

the temperature difference between different chips being controlled

H03F2200/534

Transformer coupled at the input of an amplifier

H03F2200/537

A transformer being used as coupling element between two amplifying stages

H03F2200/54

Two or more capacitor coupled amplifier stages in cascade

H03F2200/541

Transformer coupled at the output of an amplifier

H03F2200/543

A transmission line being used as coupling element between two amplifying stages

H03F2200/546

A tunable capacitance being present in an amplifier circuit

H03F2200/549

the amplifier comprising means to emulate the vacuum tube behaviour

H03F2200/552

the amplifier being made for video applications

H03F2200/555

A voltage generating circuit being realised for biasing different circuit elements

H03F2200/57

Separate feedback of real and complex signals being present

H03F2200/61

the cascode amplifier has more than one common gate stage

H03F2200/63

the amplifier being suitable for CATV applications

H03F2200/66

Clipping circuitry being present in an amplifier, i.e. the shape of the signal being modified

H03F2200/69

the amplifier stage being a common drain coupled MOSFET, i.e. source follower

H03F2200/72

the amplifier stage being a common gate configuration MOSFET

H03F2200/75

the amplifier stage being a common source configuration MOSFET

H03F2200/78

A comparator being used in a controlling circuit of an amplifier

H03F2200/81

Inputs or outputs are crossed during a first switching time, not crossed during a second switching time

H03F2200/84

A cross coupling circuit being realized by current mirrors

H03F2200/87

the cross coupling circuit being realised only by MOSFETs

H03F2200/91

the amplifier has a current mode topology

H03F2200/93

Two or more transistors are coupled in a Darlington composite transistor configuration, all transistors being of the same type

H03F2200/96

Two or more complementary transistors are coupled in a Darlington composite transistor configuration

H03F2200/99

A diode as rectifier being used as a detecting circuit in an amplifying circuit

H03F2201/00

Indexing scheme relating to details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements covered by H03F1/00

H03F2201/32

Indexing scheme relating to modifications of amplifiers to reduce non-linear distortion

H03F2201/3203

the amplifier comprising means for back off control in order to reduce distortion

H03F2201/3206

Multiple channels are combined and amplified by only one amplifier

H03F2201/3209

the amplifier comprising means for compensating memory effects

H03F2201/3212

Using a control circuit to adjust amplitude and phase of a signal in a signal path

H03F2201/3215

To increase the output power or efficiency

H03F2201/3218

the main amplifier or error amplifier being a feedforward amplifier

H03F2201/3221

Predistortion by overamplifying in a feedforward stage the distortion signal to have a combined main signal and "negative" distortion to form the predistorted signal for a further stage. so that after amplification in the further stage only the amplified main signal remains

H03F2201/3224

Predistortion being done for compensating memory effects

H03F2201/3227

Adaptive predistortion based on amplitude, envelope or power level feedback from the output of the main amplifier

H03F2201/3231

Adaptive predistortion using phase feedback from the output of the main amplifier

H03F2201/3233

Adaptive predistortion using lookup table, e.g. memory, RAM, ROM, LUT, to generate the predistortion

H03F2201/3236

A generated signal, e.g. a pulse or an inverted synchronous signal, being added to avoid certain conditions, e.g. clipping

H03F2203/00

Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00

H03F2203/20

Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers

H03F2203/21

with semiconductor devices only

H03F2203/211

using a combination of several amplifiers

H03F2203/21103

An impedance adaptation circuit being added at the input of a power amplifier stage

H03F2203/21106

An input signal being distributed in parallel over the inputs of a plurality of power amplifiers

H03F2203/21109

An input signal being distributed by switching to a plurality of paralleled power amplifiers

H03F2203/21112

A filter circuit being added at the input of a power amplifier stage

H03F2203/21115

An input signal dependant signal being measured by current measuring at the input of a power amplifier

H03F2203/21118

An input signal dependant signal being measured by power measuring at the input of a power amplifier

H03F2203/21121

An input signal dependant signal being measured by voltage measuring at the input of a power amplifier

H03F2203/21124

A parallel resonance circuit being coupled at the input of a power amplifier

H03F2203/21127

the input bias current of a power amplifier being controlled, e.g. by an active current source or a current mirror

H03F2203/21131

the input bias voltage of a power amplifier being controlled, e.g. by a potentiometer or an emitter follower

H03F2203/21133

A series resonance circuit being coupled at the input of a power amplifier

H03F2203/21136

An input signal of a power amplifier being on/off switched

H03F2203/21139

An impedance adaptation circuit being added at the output of a power amplifier stage

H03F2203/21142

Output signals of a plurality of power amplifiers are parallel combined to a common output

H03F2203/21145

Output signals are combined by switching a plurality of paralleled power amplifiers to a common output

H03F2203/21148

An output signal of a power amplifier being controlled by controlling current signal, e.g. by controlled current mirror

H03F2203/21151

An output signal of a power amplifier being controlled by controlling power signal, e.g. by an inductive coupler

H03F2203/21154

An output signal of a power amplifier being controlled by controlling voltage signal

H03F2203/21157

A filter circuit being added at the output of a power amplifier stage

H03F2203/21161

An output signal dependant signal being measured by current measuring at the output of a power amplifier

H03F2203/21163

An output signal dependant signal being measured by power measuring, e.g. by an inductive coupler, at the output of a power amplifier

H03F2203/21166

An output signal dependant signal being measured by voltage measuring at the output of a power amplifier

H03F2203/21169

A parallel resonance circuit being coupled at the output of a power amplifier

H03F2203/21172

A series resonance circuit being coupled at the output of a power amplifier

H03F2203/21175

An output signal of a power amplifier being on/off switched

H03F2203/21178

Power transistors are made by coupling a plurality of single transistors in parallel

H03F2203/21181

the supply current of a power amplifier being continuously controlled, e.g. by controlling current sources or resistors

H03F2203/21184

the supply current of a power amplifier being continuously measured, e.g. by a resistor, a current mirror, to produce a controlling signal

H03F2203/21187

the supply current of a power amplifier being measured discontinuously in time, e.g. by sampling, to produce a controlling signal

H03F2203/21191

the supply current of a power amplifier being switchable controlled, e.g. by choosing different current sources or resistors

H03F2203/21193

the supply voltage of a power amplifier being continuously controlled, e.g. by an active potentiometer

H03F2203/21196

the supply voltage of a power amplifier being switchable controlled

H03F2203/30

Indexing scheme relating to single-ended push-pull [SEPP]

Phase-splitters therefor

H03F2203/30003

the SEPP amplifier stage comprising calibration possibility

H03F2203/30006

the push and the pull stages of the SEPP amplifier are both current mirrors

H03F2203/30009

the push and pull stages of the SEPP amplifier are both cascode current mirrors

H03F2203/30012

the two SEPP amplifying transistors are Darlington composite transistors

H03F2203/30015

An input signal dependent control signal controls the bias of an output stage in the SEPP

H03F2203/30018

A series coupled active resistor and capacitor are coupled in a feedback circuit of a SEPP amplifier

H03F2203/30021

A capacitor being coupled in a feedback circuit of a SEPP amplifier

H03F2203/30024

the SEPP bias current being controlled by a control signal from a feedback circuit

H03F2203/30027

the SEPP bias voltage being controlled by a control signal from a feedback circuit

H03F2203/30031

A resistor being coupled as feedback circuit in the SEPP amplifier

H03F2203/30033

A series coupled resistor and capacitor are coupled in a feedback circuit of a SEPP amplifier

H03F2203/30036

A feedback circuit to stabilise the SEPP being used

H03F2203/30039

the SEPP bias current being controlled by a control signal from a feedforward circuit

H03F2203/30042

the SEPP bias voltage being controlled by a control signal from a feedforward circuit

H03F2203/30045

the SEPP power transistors comprising measuring push or pull transistors to produce a controlling signal

H03F2203/30048

the SEPP amplifier has multiple SEPP outputs from paralleled output stages coupled in one or more outputs

H03F2203/30051

the SEPP amplifying transistors are composed of multiple coupled transistors

H03F2203/30054

the SEPP power transistors are realised as paralleled cascode coupled transistors, i.e. the push or the pull transistors

H03F2203/30057

the SEPP power transistors are realised as paralleled FETs, i.e. the push or the pull transistor

H03F2203/30061

One or more current mirrors are used as bias circuit or stages for the push or pull stages

H03F2203/30063

A differential amplifier being used in the bias circuit or in the control circuit of the SEPP-amplifier

H03F2203/30066

A optical element being used in the bias circuit of the SEPP-amplifier

H03F2203/30069

A SEPP amplifier with a reactive element in the bias circuit

H03F2203/30072

the SEPP has a power supply switchable by a controlling signal derived from the input signal

H03F2203/30075

the SEPP has a power supply switchable by a controlling signal derived from the output signal

H03F2203/30078

A resistor being added in the pull stage of the SEPP amplifier

H03F2203/30081

the pull transistor circuit comprising one or more capacitors

H03F2203/30084

the pull circuit of the SEPP amplifier being a cascode circuit

H03F2203/30087

Only the bias of the pull transistor of the SEPP being dynamically controlled by the input signal

H03F2203/30091

the pull side of the SEPP amplifier has an extra drive follower stage to control this pull side

H03F2203/30093

the pull side of the SEPP amplifier has an extra drive inverter stage to control this pull side

H03F2203/30096

An op amp being used as extra drive amp for the pull side of the SEPP

H03F2203/30099

the pull transistor being gated by a switching element

H03F2203/30102

the pull transistor has a measuring transistor for controlling purposes

H03F2203/30105

the pull transistor of the asymmetrically driven SEPP amplifier being a driven current mirror

H03F2203/30108

the pull transistor of the SEPP amplifier being a cascode current mirror

H03F2203/30111

A resistor being added in the push stage of the SEPP amplifier

H03F2203/30114

the push transistor circuit comprising one or more capacitors

H03F2203/30117

the push circuit of the SEPP amplifier being a cascode circuit

H03F2203/30121

Only the bias of the push transistor of the SEPP being dynamically controlled by the input signal

H03F2203/30123

the push side of the SEPP amplifier has an extra drive follower stage to control this push side

H03F2203/30126

the push side of the SEPP amplifier has an extra drive inverter stage to control this push side

H03F2203/30129

An op amp being used as extra drive amp for the push side of the SEPP

H03F2203/30132

the push transistor being gated by a switching element

H03F2203/30135

the push transistor has a measuring transistor for controlling purposes

H03F2203/30138

the push transistor of the asymmetrically driven SEPP amplifier being a driven current mirror

H03F2203/30141

the push transistor of the SEPP amplifier being a cascode current mirror

H03F2203/30144

the SEPP comprising a reactive element in the amplifying circuits

H03F2203/30147

the current sink of the push driven, i.e. source driven SEPP amplifier being a current mirror

H03F2203/30151

the current sink of the push driven, i.e. source driven SEPP amplifier being a cascode current mirror

H03F2203/30153

the current source of the pull driven, i.e. sink driven SEPP amplifier being a current mirror

H03F2203/30156

the current source of the pull driven, i.e. sink driven SEPP amplifier being a cascode current mirror

H03F2203/45

Indexing scheme relating to differential amplifiers

H03F2203/45002

the addition of two signals being made by addition of two currents by coupling the outputs of two current mirrors in parallel

H03F2203/45004

the addition of two signals being made by addition of two currents by coupling two current sources in parallel

H03F2203/45006

the addition of two signals being made by two emitter or source coupled followers

H03F2203/45008

the addition of two signals being made by a resistor addition circuit for producing the common mode signal

H03F2203/45011

the addition of two signals being made in a source degeneration circuit of a current mirror for producing the common mode signal

H03F2203/45012

the addition of two signals being made in a switched capacitor circuit for producing the common mode signal

H03F2203/45014

the addition of two signals being made in the tail circuit of a differential amplifier for producing the common mode signal

H03F2203/45016

the addition of two signals being made by paralleling two triode biased transistors for producing the common mode signal

H03F2203/45018

the differential amplifier amplifying transistors have added cross couplings

H03F2203/45021

One or more added diodes to the amplifying transistors in the differential amplifier

H03F2203/45022

One or more added resistors to the amplifying transistors in the differential amplifier

H03F2203/45024

the differential amplifier amplifying transistors are cascode coupled transistors

H03F2203/45026

One or more current sources are added to the amplifying transistors in the differential amplifier

H03F2203/45028

the differential amplifier amplifying transistors are folded cascode coupled transistors

H03F2203/45031

the differential amplifier amplifying transistors are compositions of multiple transistors

H03F2203/45032

the differential amplifier amplifying transistors are multiple paralleled transistors

H03F2203/45034

One or more added reactive elements, capacitive or inductive elements, to the amplifying transistors in the differential amplifier

H03F2203/45036

the differential amplifier amplifying transistors are single transistors

H03F2203/45038

One or more current sources are added or changed as balancing means to reduce the offset of the dif amp

H03F2203/45041

Fuses are blown to balance the dif amp to reduce the offset of the dif amp

H03F2203/45042

One or more resistors are added or changed as balancing to reduce the offset of the dif amp

H03F2203/45044

One or more switches are opened or closed to balance the dif amp to reduce the offset of the dif amp

H03F2203/45046

the base current of the amplifying transistors of a dif amp being compensated for providing a greater input impedance of the amplifier

H03F2203/45048

Calibrating and standardising a dif amp

H03F2203/45051

Two or more differential amplifiers cascade coupled

H03F2203/45052

the cascode stage of the cascode differential amplifier being controlled by a controlling signal, which controlling signal can also be the input signal

H03F2203/45054

the cascode stage of the cascode dif amp being a current mirror

H03F2203/45056

One or both transistors of the cascode stage of a differential amplifier being composed of more than one transistor

H03F2203/45058

the cascode stage of the differential amplifier comprising a reactive element

H03F2203/45061

the common mode reference signal being taken or deducted from the one or more inputs of the differential amplifier

H03F2203/45062

the common mode signal, e.g. voltage or current being added to the cascode stage of the cascode or folded cascode differential amplifier

H03F2203/45064

the resulting deducted common mode signal being added to the folding circuit of the folded differential amplifier

H03F2203/45066

the resulting deducted common mode signal being added at the one or more inputs of the differential amplifier

H03F2203/45068

the resulting deducted common mode signal being added at the one or more outputs of the differential amplifier

H03F2203/45071

the resulting deducted common mode signal being added at the substrate or body regions of the components of the differential amplifier

H03F2203/45072

the common mode voltage or current signal being added to the tail circuit of the differential amplifier

H03F2203/45074

A comparator circuit compares the common mode signal to a reference before controlling the differential amplifier or related stages

H03F2203/45076

the resulting deducted common mode signal being added to or controls the differential amplifier, and being a current signal

H03F2203/45078

the common mode signal being taken or deducted from the one or more inputs of the differential amplifier

H03F2203/45081

the common mode signal being level shifted before using it for controlling or adding

H03F2203/45082

the common mode signal being taken or deducted from the one or more outputs of the differential amplifier

H03F2203/45084

the common mode signal circuit comprising one or more inductive or capacitive elements, e.g. filter circuitry

H03F2203/45086

the common mode signal being taken or deducted from the tail circuit of the differential amplifier

H03F2203/45088

the resulting deducted common mode signal being added to or controls the differential amplifier, and being a voltage signal

H03F2203/45091

Two complementary type differential amplifiers are paralleled, e.g. one of the p-type and one of the n-type

H03F2203/45092

Two current sources bias one set of two common base transistors cascaded with two other common base transistors, the common base transistors being driven complementary

H03F2203/45094

the dif amp being realized by coupling the emitters respectively sources of two common collector respectively drain transistors of a first type to the emitters respectively sources of two common base respectively gate transistors of a second complementary type

H03F2203/45096

the difference of two signals being made by, e.g. combining two or more current mirrors, e.g. differential current mirror

H03F2203/45098

Two current mirrors coupled in a subtracting configuration

H03F2203/45101

Control of the DC level being present

H03F2203/45102

A diode being used as clamping element at the input of the dif amp

H03F2203/45104

A diode being used as clamping element at the loading circuit of the dif amp

H03F2203/45106

A diode being used as clamping element at the output of the dif amp

H03F2203/45108

A diode being used as level shifter between stages or in a follower in relation with a dif amp

H03F2203/45111

Two dif amps of the same type are used one dif amp for each input signal

H03F2203/45112

the biasing of the differential amplifier being controlled from the input or the output signal

H03F2203/45114

the differential amplifier contains another differential amplifier in its feedback circuit

H03F2203/45116

Feedback coupled to the input of the differential amplifier

H03F2203/45118

At least one reactive element being added to at least one feedback circuit of a dif amp

H03F2203/45121

A floating gate element being part of a dif amp

H03F2203/45122

the folded cascode stage of the folded cascode differential amplifier being controlled by a controlling signal

H03F2203/45124

the folded cascode stage of the folded cascode dif amp being a current mirror

H03F2203/45126

One or both transistors of the folded cascode stage of a folded cascode dif amp are composed of more than one transistor

H03F2203/45128

the folded cascode stage of the folded cascode dif amp contains a reactive element

H03F2203/45131

A follower being added between the dif amp and other explicit stages in the amplifying circuit

H03F2203/45132

A source follower using multiple single follower stages cascaded in a composed follower being added to the dif amp

H03F2203/45134

the whole differential amplifier together with other coupled stages being fully differential realised

H03F2203/45136

One differential amplifier in IC-block form being shown

H03F2203/45138

Two or more differential amplifiers in IC-block form are combined, e.g. measuring amplifiers

H03F2203/45141

A cross coupled pair of transistors being added in the input circuit of a differential amplifier

H03F2203/45142

At least one diode being added at the input of a dif amp

H03F2203/45144

At least one follower being added at the input of a dif amp

H03F2203/45146

At least one op amp being added at the input of a dif amp

H03F2203/45148

At least one reactive element being added at the input of a dif amp

H03F2203/45151

At least one resistor being added at the input of a dif amp

H03F2203/45152

Balancing means being added at the input of a dif amp to reduce the offset of the dif amp

H03F2203/45154

the bias at the input of the amplifying transistors being controlled

H03F2203/45156

At least one capacitor being added at the input of a dif amp

H03F2203/45158

One or more diodes coupled at the inputs of a dif amp as clamping elements

H03F2203/45161

One or more diodes coupled at the inputs of a dif amp as level shifting circuit elements

H03F2203/45162

A parallel resonance circuit being added in the one or more input circuits of the dif amp

H03F2203/45164

A series resonance circuit being added in the one or more input circuits of the dif amp

H03F2203/45166

Only one input of the dif amp being used for an input signal

H03F2203/45168

A dif amp being used as input stage to one or more other non-differential stages

H03F2203/45171

the input signal being switched to the one or more input terminals of the differential amplifier

H03F2203/45172

A transformer being added at the input of the dif amp

H03F2203/45174

the application of the differential amplifier being in an integrator circuit

H03F2203/45176

A cross coupling circuit, e.g. consisting of two cross coupled transistors, being added in the load circuit of the amplifying transistors of a differential amplifier

H03F2203/45178

the differential amplifier contains one or more extra resistors in the active load circuit

H03F2203/45181

Compensation of unbalanced loading in dif amps, e.g. unbalancing by connecting unequal circuits on both load circuits of the dif amp

H03F2203/45182

the differential amplifier contains one or more cascode current mirrors in the load

H03F2203/45184

the differential amplifier has one or more cascode current sources in the load

H03F2203/45186

the differential amplifier contains clamping components in the load circuit

H03F2203/45188

the differential amplifier contains one or more current sources in the load

H03F2203/45191

One or more diodes not belonging to a current mirror as loads of a dif amp

H03F2203/45192

the differential amplifier contains current mirrors comprising diodes which act as a load for the differential amplifier

H03F2203/45194

At least one active load circuit of the two load circuits in a differential amplifier being realised with a combination of more than one transistor

H03F2203/45196

A differential amplifier with one or more parallel coupled LC-circuits as load

H03F2203/45198

A parallel resonance circuit being added in the one or more load circuits of the dif amp

H03F2203/45201

the differential amplifier contains one or more reactive elements, i.e. capacitive or inductive elements, in the load

H03F2203/45202

the differential amplifier contains only resistors in the load

H03F2203/45204

A series resonance circuit being added in the one or more load circuits of the dif amp

H03F2203/45206

One or two switches are coupled in the loading circuit of the dif amp

H03F2203/45208

the dif amp being of the long tail pair type, one current source being coupled to the common emitter of the amplifying transistors

H03F2203/45211

the amplifying transistors have multiple collectors with a cross coupling

H03F2203/45212

the differential amplifier being designed to have a reduced offset

H03F2203/45214

Offset in a differential amplifier being reduced by control of the substrate voltage, the voltage being either fixed or variable

H03F2203/45216

A cross coupling circuit being added at the output terminals of the amplifying transistors of a differential amplifier

H03F2203/45218

Diode clamping means are present at the output of a differential amplifier

H03F2203/45221

the output signal being taken from the two complementary outputs of the differential amplifier

H03F2203/45222

the differential amplifier output being directly controlled by a feedback or feedforward circuit coupled at the output of the dif amp

H03F2203/45224

One output of the differential amplifier being taken into consideration

H03F2203/45226

the output signal being switched taken from the one or more output terminals of the differential amplifier

H03F2203/45228

A transformer being added at the output or the load circuit of the dif amp

H03F2203/45231

Two dif amps of the cascode type are paralleled at their input gates or bases

H03F2203/45232

Two dif amps of the folded cascode type are paralleled at their input gates or bases

H03F2203/45234

Two dif amps, one of them being of the cascade type and the other one of the folded cascade type, are paralleled at their input gates or bases

H03F2203/45236

Two dif amps realised in MOS or JFET technology, one of them being of the p-channel type and the other one of the n-channel type, are coupled in parallel with their gates

H03F2203/45238

Two dif amps realised in FET technology, the dif amps being either both of the NMOS type or both of the PMOS type, are coupled in parallel with their gates and their drains

H03F2203/45241

Two dif amps realised in MOS or JFET technology, the dif amps being either both of the p-channel type or both of the n-channel type, are coupled in parallel with their gates

H03F2203/45242

Two dif amps are paralleled at their inputs, the dif amps being of different types, e.g. one long tail type and one complementary or pi type

H03F2203/45244

the differential amplifier contains one or more explicit bias circuits, e.g. to bias the tail current sources, to bias the load transistors

H03F2203/45246

the dif amp being biased in the subthreshold region

H03F2203/45248

the dif amp being designed for improving the slew rate

H03F2203/45251

the dif amp has a cross coupling circuit in the source circuit of the amplifying transistors

H03F2203/45252

Diodes are added in the source circuit of the amplifying FETs of the dif amp

H03F2203/45254

A parallel resonance circuit being added in the one or more source circuits of the amplifying FETs of the dif amp

H03F2203/45256

One or more reactive elements are added in the source circuit of the amplifying FETs of the dif amp

H03F2203/45258

Resistors are added in the source circuit of the amplifying FETs of the dif amp

H03F2203/45261

A series resonance circuit being added in the one or more source circuits of the amplifying FETs of the dif amp

H03F2203/45262

the two amplifying FETs, amplifying two complementary input signals, are not source coupled, i.e. no tail being present

H03F2203/45264

the dif amp comprising frequency or phase stabilisation means

H03F2203/45266

the stage cascaded to the dif amp being an asymmetrical follower stage

H03F2203/45268

A common gate stage being coupled at the one or more outputs of the dif amp

H03F2203/45271

the output current being reduced by a transistor which being controlled by the input signal to sink current

H03F2203/45272

the output current being increased by a transistor which being controlled by the input signal to source current

H03F2203/45274

Level shifting stages are added to the differential amplifier at a position other than the one or more inputs of the dif amp

H03F2203/45276

An op amp as stage being coupled to the output of a dif amp

H03F2203/45278

Two SEPP stages are added to the differential amplifier, the outputs of the two SEPP stages being the two outputs of the whole amplifier

H03F2203/45281

One SEPP output stage being added to the differential amplifier

H03F2203/45282

the differential amplifier being coupled to a symmetrical follower output stage

H03F2203/45284

Sensing the temperature dependence by a temperature dependant sensor, e.g. a resistor, a diode

H03F2203/45286

the temperature dependence of a differential amplifier being controlled

H03F2203/45288

Differential amplifier with circuit arrangements to enhance the transconductance

H03F2203/45291

the active amplifying circuit [AAC] comprising balancing means

H03F2203/45292

the AAC comprising biasing means controlled by the signal

H03F2203/45294

the AAC comprising biasing means to stabilise itself

H03F2203/45296

the AAC comprising one or more discrete capacitive elements, e.g. a transistor coupled as capacitor

H03F2203/45298

the AAC comprising one or more combinations of discrete capacitor and resistor elements, e.g. active elements using a transistor as a capacitor or as a resistor

H03F2203/45301

there are multiple cascaded folded or not folded common gate stages of a cascode dif amp

H03F2203/45302

the common gate stage of a cascode dif amp being controlled

H03F2203/45304

the common gate stage of a BIFET cascode dif amp being implemented fully by FETs

H03F2203/45306

the common gate stage implemented as dif amp eventually for cascode dif amp

H03F2203/45308

the common gate stage of a cascode dif amp being implemented as one mirror circuit

H03F2203/45311

the common gate stage of a cascode dif amp being implemented by multiple transistors

H03F2203/45312

there being only one common gate stage of a cascode dif amp

H03F2203/45314

the AAC comprising clamping means, e.g. diodes

H03F2203/45316

the AAC comprising one or more discrete inductive elements or coils

H03F2203/45318

the AAC comprising a cross coupling circuit, e.g. two extra transistors cross coupled

H03F2203/45321

the common source stage of a BIFET cascode dif amp being implemented fully by FETs

H03F2203/45322

One or more current sources are added to the AAC

H03F2203/45324

the AAC comprising a Darlington transistor circuit

H03F2203/45326

the AAC comprising one or more extra diodes, e.g. as level shifter, as diode coupled transistors

H03F2203/45328

the AAC comprising one diode coupled AAC-transistor in a follower combination with the other AAC circuit part

H03F2203/45331

the AAC comprising one or more diodes coupled as a shunt between the AAC-transistors in the AAC

H03F2203/45332

the AAC comprising one or more capacitors as feedback circuit elements

H03F2203/45334

the AAC comprising one or more dif amps as feedback circuit elements

H03F2203/45336

the AAC comprising one or more resistors as feedback circuit elements

H03F2203/45338

the AAC comprising one or more series circuits of a resistor and a capacitor as feedback circuit elements

H03F2203/45341

the AAC comprising controlled floating gates

H03F2203/45342

the AAC comprising control means on a back gate of the AAC

H03F2203/45344

At least one of the AAC sub-circuits being a current mirror

H03F2203/45346

the AAC comprising one or more FETs with multiple drains

H03F2203/45348

the AAC comprising one or more FETs with multiple gates

H03F2203/45351

the AAC comprising one or more FETs with multiple sources

H03F2203/45352

the AAC comprising a combination of a plurality of transistors, e.g. Darlington coupled transistors

H03F2203/45354

the AAC comprising offset means

H03F2203/45356

the AAC comprising one or more op-amps, e.g. IC-blocks

H03F2203/45358

the AAC comprising multiple transistors parallel coupled at their sources and drains only, e.g. in a cascode dif amp, only those forming the composite common source transistor

H03F2203/45361

the AAC comprising multiple transistors parallel coupled at their drains only, e.g. in a cascode dif amp, only those forming the composite common source transistor

H03F2203/45362

the AAC comprising multiple transistors parallel coupled at their gates and drains only, e.g. in a cascode dif amp, only those forming the composite common source transistor

H03F2203/45364

the AAC comprising multiple transistors parallel coupled at their gates and sources only, e.g. in a cascode dif amp, only those forming the composite common source transistor

H03F2203/45366

the AAC comprising multiple transistors parallel coupled at their gates only, e.g. in a cascode dif amp, only those forming the composite common source transistor

H03F2203/45368

the AAC comprising multiple transistors parallel coupled at their sources only, e.g. in a cascode dif amp, only those forming the composite common source transistor

H03F2203/45371

the AAC comprising parallel coupled multiple transistors at their source and gate and drain or at their base and emitter and collector, e.g. in a cascode dif amp, only those forming the composite common source transistor or the composite common emitter transistor respectively

H03F2203/45372

the AAC comprising one or more potentiometers

H03F2203/45374

the AAC comprising one or more discrete resistors

H03F2203/45376

the AAC comprising one or more discrete resistors as shunts between collectors or drains

H03F2203/45378

the AAC comprising saturation or cutoff avoiding means, e.g. as a feedback circuit

H03F2203/45381

the AAC comprising multiple transistors coupled in shunt

H03F2203/45382

the AAC comprising common gate stages in the source circuit of the AAC before the common source coupling

H03F2203/45384

the AAC comprising common gate stages in the source circuit of the AAC before the common source coupling in which the common gate stage being controlled

H03F2203/45386

the AAC comprising one or more coils in the source circuit

H03F2203/45388

the AAC comprising diodes in the source circuit of the AAC before the common source coupling

H03F2203/45391

the AAC comprising potentiometers in the source circuit of the AAC before the common source coupling

H03F2203/45392

the AAC comprising resistors in the source circuit of the AAC before the common source coupling

H03F2203/45394

the AAC of the dif amp comprising FETs whose sources are not coupled, i.e. the AAC being a pseudo-differential amplifier

H03F2203/45396

the AAC comprising one or more switches

H03F2203/45398

the AAC comprising a voltage generating circuit as bias circuit for the AAC

H03F2203/45401

the common mode controlling loop [CMCL] comprising a transistor resistor addition circuit

H03F2203/45402

the CMCL comprising a buffered addition circuit, i.e. the signals are buffered before addition, e.g. by a follower

H03F2203/45404

the CMCL comprising capacitors containing, not in parallel with the resistors, an addition circuit

H03F2203/45406

the CMCL comprising a common source node of a long tail FET pair as an addition circuit

H03F2203/45408

the CMCL comprising a short circuited differential output of a dif amp as an addition circuit

H03F2203/45411

the CMCL comprising a diode addition circuit, e.g. using diode connected transistors

H03F2203/45412

the CMCL comprising a folding circuit as addition circuit

H03F2203/45414

the CMCL comprising a current mirror addition circuit

H03F2203/45416

the CMCL comprising no addition of the dif signals to produce a common mode signal

H03F2203/45418

the CMCL comprising a resistor addition circuit

H03F2203/45421

the CMCL comprising a switched capacitor addition circuit

H03F2203/45422

the CMCL comprising one or more capacitors not as integrating capacitor, e.g. for stability purposes

H03F2203/45424

the CMCL comprising a comparator circuit

H03F2203/45426

the CMCL comprising a comparator circuit with extra buffering means before comparison of the common mode signal, e.g. by a follower

H03F2203/45428

the CMCL comprising a comparator circuit using a four inputs dif amp

H03F2203/45431

the CMCL output control signal being a current signal

H03F2203/45432

the CMCL output control signal being a current signal and being buffered before used to control

H03F2203/45434

the CMCL output control signal being a voltage signal

H03F2203/45436

the CMCL output control signal being a voltage signal and being buffered before used to control

H03F2203/45438

the CMCL uses digital signals

H03F2203/45441

the CMCL comprising an integrating circuit

H03F2203/45442

the CMCL comprising multiple loops for the same stage or for different stages in the amplifier

H03F2203/45444

the CMCL comprising a sample and hold circuit

H03F2203/45446

there are two or more CMCLs

H03F2203/45448

the common source circuit [CSC] comprising an addition circuit made by mirrors

H03F2203/45451

the CSC comprising an addition circuit made by added current sources

H03F2203/45452

the CSC comprising balancing means

H03F2203/45454

the CSC comprising biasing means controlled by the input signal

H03F2203/45456

the CSC comprising bias stabilisation means, e.g. DC-level stability, positive or negative temperature coefficient dependent control

H03F2203/45458

the CSC comprising one or more capacitors

H03F2203/45461

the CSC comprising one or more switched capacitors

H03F2203/45462

the CSC comprising a cascode circuit

H03F2203/45464

the CSC comprising one or more coils

H03F2203/45466

the CSC being controlled, e.g. by a signal derived from a non specified place in the dif amp circuit

H03F2203/45468

the CSC comprising a cross coupling circuit, e.g. comprising two cross-coupled transistors

H03F2203/45471

the CSC comprising one or more extra current sources

H03F2203/45472

the CSC comprising one or more diodes

H03F2203/45474

the CSC comprising controlled one or more floating gates

H03F2203/45476

the CSC comprising a mirror circuit

H03F2203/45478

the CSC comprising a cascode mirror circuit

H03F2203/45481

the CSC comprising only a direct connection to the supply voltage, no other components being present

H03F2203/45482

the CSC comprising offset means

H03F2203/45484

the CSC comprising one or more op-amps

H03F2203/45486

the CSC comprising two or more paralleled transistors as current source

H03F2203/45488

the CSC being a pi circuit and a capacitor being used at the place of the resistor

H03F2203/45491

the CSC being a pi circuit and the resistor being implemented by one or more transistors

H03F2203/45492

the CSC being a pi circuit and the resistor being implemented by one or more controlled transistors

H03F2203/45494

the CSC comprising one or more potentiometers

H03F2203/45496

the CSC comprising one or more extra resistors

H03F2203/45498

the CSC comprising only resistors

H03F2203/45501

the CSC comprising a L-C parallel resonance circuit

H03F2203/45502

the CSC comprising a L-C series resonance circuit

H03F2203/45504

the CSC comprising more than one switch

H03F2203/45506

the CSC comprising only one switch

H03F2203/45508

the CSC comprising a voltage generating circuit as bias circuit for the CSC

H03F2203/45511

the feedback circuit [FBC] comprising one or more transistor stages, e.g. cascaded stages of the dif amp, and being coupled between the loading circuit [LC] and the input circuit [IC]

H03F2203/45512

the FBC comprising one or more capacitors, not being switched capacitors, and being coupled between the LC and the IC

H03F2203/45514

the FBC comprising one or more switched capacitors, and being coupled between the LC and the IC

H03F2203/45516

the FBC comprising a coil and being coupled between the LC and the IC

H03F2203/45518

the FBC comprising one or more diodes and being coupled between the LC and the IC

H03F2203/45521

the FBC comprising op amp stages, e.g. cascaded stages of the dif amp and being coupled between the LC and the IC

H03F2203/45522

the FBC comprising one or more potentiometers

H03F2203/45524

the FBC comprising one or more active resistors and being coupled between the LC and the IC

H03F2203/45526

the FBC comprising a resistor-capacitor combination and being coupled between the LC and the IC

H03F2203/45528

the FBC comprising one or more passive resistors and being coupled between the LC and the IC

H03F2203/45531

the FBC comprising a parallel resonance circuit and being coupled between the LC and the IC

H03F2203/45532

the FBC comprising a series resonance circuit and being coupled between the LC and the IC

H03F2203/45534

the FBC comprising multiple switches and being coupled between the LC and the IC

H03F2203/45536

the FBC comprising a switch and being coupled between the LC and the IC

H03F2203/45538

the IC comprising balancing means, e.g. trimming means

H03F2203/45541

the IC comprising dynamic biasing means, i.e. controlled by the input signal

H03F2203/45542

the IC comprising bias stabilisation means, e.g. DC level stabilisation, and temperature coefficient dependent control, e.g. by DC level shifting

H03F2203/45544

the IC comprising one or more capacitors, e.g. coupling capacitors

H03F2203/45546

the IC comprising one or more capacitors feedback coupled to the IC

H03F2203/45548

the IC comprising one or more capacitors as shunts to earth or as short circuit between inputs

H03F2203/45551

the IC comprising one or more switched capacitors

H03F2203/45552

the IC comprising clamping means, e.g. diodes

H03F2203/45554

the IC comprising one or more coils

H03F2203/45556

the IC comprising a common gate stage as input stage to the dif amp

H03F2203/45558

the IC being coupled at the sources of the source coupled pair

H03F2203/45561

the IC being controlled, e.g. by a signal derived from a non specified place in the dif amp circuit

H03F2203/45562

the IC comprising a cross coupling circuit, e.g. comprising two cross-coupled transistors

H03F2203/45564

the IC comprising one or more extra current sources

H03F2203/45566

the IC comprising one or more dif stages in cascade with the dif amp

H03F2203/45568

the IC comprising one or more diodes as shunt to the input leads

H03F2203/45571

the IC comprising two diodes, e.g. Gilbert circuit

H03F2203/45572

the IC comprising one or more Zener diodes to the input leads

H03F2203/45574

the IC comprising four or more input leads connected to four or more AAC-transistors

H03F2203/45576

the IC comprising input impedance adapting or controlling means

H03F2203/45578

the IC comprising one or more diodes as level shifters

H03F2203/45581

the IC comprising one or more resistors as level shifters

H03F2203/45582

the IC comprising one or more voltage sources as level shifters

H03F2203/45584

the IC comprising extra differentially coupled transistors for controlling purposes only

H03F2203/45586

the IC comprising offset generating means

H03F2203/45588

the IC comprising offset compensating means

H03F2203/45591

the IC comprising one or more potentiometers

H03F2203/45592

the IC comprising one or more buffer stages other than emitter or source followers between the input signal leads and input leads of the dif amp, e.g. inverter stages

H03F2203/45594

the IC comprising one or more resistors, which are not biasing resistor

H03F2203/45596

the IC comprising one or more biasing resistors

H03F2203/45598

the IC comprising an input shunting circuit comprising a resistor and a capacitor in series

H03F2203/45601

the IC comprising one or more passive resistors by feedback

H03F2203/45602

the IC comprising one or more active resistors by feedback

H03F2203/45604

the IC comprising a input shunting resistor

H03F2203/45606

the IC comprising one or more parallel resonance circuits

H03F2203/45608

the IC comprising one or more series resonance circuits

H03F2203/45611

the IC comprising only one input signal connection lead for one phase of the signal

H03F2203/45612

the IC comprising one or more input source followers as input stages in the IC

H03F2203/45614

the IC comprising two cross coupled switches

H03F2203/45616

the IC comprising more than one switch, which are not cross coupled

H03F2203/45618

the IC comprising only one switch

H03F2203/45621

the IC comprising a transformer for phase splitting the input signal

H03F2203/45622

the IC comprising a voltage generating circuit

H03F2203/45624

the LC comprising balancing means, e.g. trimming means

H03F2203/45626

the LC comprising biasing means controlled by the input signal

H03F2203/45628

the LC comprising bias stabilisation means, e.g. DC level stabilisation means, and temperature coefficient dependent control, e.g. DC level shifting means

H03F2203/45631

the LC comprising one or more capacitors, e.g. coupling capacitors

H03F2203/45632

the LC comprising one or more capacitors coupled to the LC by feedback

H03F2203/45634

the LC comprising one or more switched capacitors

H03F2203/45636

the LC comprising clamping means, e.g. diodes

H03F2203/45638

the LC comprising one or more coils

H03F2203/45641

the LC being controlled, e.g. by a signal derived from a non specified place in the dif amp circuit

H03F2203/45642

the LC, and possibly also cascaded stages following it, being (are) controlled by the common mode signal derived to control a dif amp

H03F2203/45644

the LC comprising a cross coupling circuit, e.g. comprising two cross-coupled transistors

H03F2203/45646

the LC comprising an extra current source

H03F2203/45648

the LC comprising two current sources, which are not cascode current sources

H03F2203/45651

the LC comprising two cascode current sources

H03F2203/45652

the LC comprising one or more further dif amp stages, either identical to the dif amp or not, in cascade

H03F2203/45654

the LC comprising one or more extra diodes not belonging to mirrors

H03F2203/45656

the LC comprising one diode of a current mirror, i.e. forming an asymmetrical load

H03F2203/45658

the LC comprising two diodes of current mirrors

H03F2203/45661

the LC comprising one or more controlled floating gates

H03F2203/45662

the LC comprising inductive coupled loading elements

H03F2203/45664

the LC comprising one or more cascaded inverter stages as output stage at one output of the dif amp circuit

H03F2203/45666

the LC comprising two anti-phase controlled inverter circuits as output stages, e.g. fully differential

H03F2203/45668

the LC comprising a level shifter circuit, which does not comprise diodes

H03F2203/45671

the LC comprising one or more diodes as level shifter

H03F2203/45672

the LC comprising one or more resistors as level shifter

H03F2203/45674

the LC comprising one current mirror

H03F2203/45676

the LC comprising one cascode current mirror

H03F2203/45678

the LC comprising offset generating means

H03F2203/45681

the LC comprising offset compensating means

H03F2203/45682

the LC comprising one or more op-amps

H03F2203/45684

the LC comprising one or more buffers or driving stages not being of the emitter respectively source follower type, between the output of the dif amp and the output stage

H03F2203/45686

the LC comprising one or more potentiometers, which are not shunting potentiometers

H03F2203/45688

the LC comprising one or more shunting potentiometers

H03F2203/45691

the LC comprising one or more transistors as active loading resistors

H03F2203/45692

the LC comprising one or more resistors in series with a capacitor coupled to the LC by feedback

H03F2203/45694

the LC comprising more than one shunting resistor

H03F2203/45696

the LC comprising more than two resistors

H03F2203/45698

the LC comprising one or more resistors coupled to the LC by feedback (active or passive)

H03F2203/45701

the LC comprising one resistor

H03F2203/45702

the LC comprising two resistors

H03F2203/45704

the LC comprising one or more parallel resonance circuits

H03F2203/45706

the LC comprising one or more series resonance circuits

H03F2203/45708

the LC comprising one SEPP circuit as output stage

H03F2203/45711

the LC comprising two anti-phase controlled SEPP circuits as output stages, e.g. fully differential

H03F2203/45712

the LC comprising a capacitor as shunt

H03F2203/45714

the LC comprising a coil as shunt

H03F2203/45716

the LC comprising a RC-series circuit as shunt, e.g. for stabilisation

H03F2203/45718

the LC comprising a resistor as shunt

H03F2203/45721

the LC comprising only an output circuit for one phase of the signal

H03F2203/45722

the LC comprising one or more source followers, as post buffer or driver stages, in cascade in the LC

H03F2203/45724

the LC comprising two cross coupled switches

H03F2203/45726

the LC comprising more than one switch, which are not cross coupled

H03F2203/45728

the LC comprising one switch

H03F2203/45731

the LC comprising a transformer

H03F2203/45732

the LC comprising a voltage generating circuit

H03F2203/50

Indexing scheme relating to amplifiers in which input being applied to, or output being derived from, an impedance common to input and output circuits of the amplifying element, e.g. cathode follower

H03F2203/5003

the sources of two source followers are differentially coupled

H03F2203/5006

the input signal being capacitively coupled to the gate of the source follower

H03F2203/5009

the output signal being capacitively coupled to the source of the source follower

H03F2203/5012

the source follower has a controlled source circuit, the controlling signal being derived from the drain circuit of the follower

H03F2203/5015

the source follower has a controlled source circuit, the controlling signal being derived from the gate circuit of the follower

H03F2203/5018

the source follower has a controlled source circuit, the controlling signal being derived from the source circuit of the follower

H03F2203/5021

the source follower has a controlled source circuit

H03F2203/5024

the source follower has a controlled source circuit, the source circuit being controlled via a capacitor, i.e. AC-controlled

H03F2203/5027

the source follower has a current mirror output circuit in its source circuit

H03F2203/5031

the source circuit of the follower being a current source

H03F2203/5033

Two source followers are controlled at their inputs by a differential signal

H03F2203/5036

the source follower has a resistor in its source circuit

H03F2203/5039

the source circuit of the follower has one or more capacitors between source and supply

H03F2203/5042

the source circuit of the follower has one or more coils between source and supply

H03F2203/5045

the source follower has a level shifter between source and output, e.g. a diode-connected transistor

H03F2203/72

Indexing scheme relating to gated amplifiers, i.e. amplifiers which are rendered operative or inoperative by means of a control signal

H03F2203/7203

the gated amplifier being switched on or off by a switch in the bias circuit of the amplifier controlling a bias current in the amplifier

H03F2203/7206

the gated amplifier being switched on or off by a switch in the bias circuit of the amplifier controlling a bias voltage in the amplifier

H03F2203/7209

the gated amplifier being switched from a first band to a second band

H03F2203/7212

the gated amplifier being switched on or off by switching off or on a feedback control loop of the amplifier

H03F2203/7215

the gated amplifier being switched on or off by a switch at the input of the amplifier

H03F2203/7218

the gated amplifier being switched on or off by clamping by a switch at the input of the amplifier

H03F2203/7221

the gated amplifier being switched on or off by a switch at the output of the amplifier

H03F2203/7224

the gated amplifier being switched on or off by clamping by a switch at the output of the amplifier

H03F2203/7227

the gated amplifier being switched on or off by a switch in the supply circuit of the amplifier

H03F2203/7231

the gated amplifier being switched on or off by putting into cascade or not, by choosing between amplifiers by one or more switch(es)

H03F2203/7233

the gated amplifier, switched on or off by putting into parallel or not, by choosing between amplifiers by one or more switch(es), being impedance adapted by switching an adapted passive network

H03F2203/7236

the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers by (a ) switch(es)

H03F2203/7239

the gated amplifier being switched on or off by putting into parallel or not, by choosing between amplifiers and shunting lines by one or more switch(es)