ClassID:

219611

H03F2200/351 - CPC Classification

Classification description:

Indexing scheme relating to amplifiers Pulse width modulation being used in an amplifying circuit

Recent Application in this class:
#1
20260163536
2026-06-11

INTEGRATED CIRCUIT FOR CLASS-D AUDIO AMPLIFIER AND ASSOCIATED CONTROL METHOD

#2
20260160830
2026-06-11

CIRCUIT FOR DETECTING SHORT CIRCUITS IN FULL-BRIDGE CLASS-D AMPLIFIERS AND CORRESPONDING METHOD

#3
20260155792
2026-06-04

HYBRID DIFFERENTIAL AMPLIFIER AND METHOD THEREOF

#4
20260142628
2026-05-21

Class-D amplifier

#5
20260121585
2026-04-30

AMPLIFIER USING VARYING PULSE WIDTHS

#6
20260095171
2026-04-02

Method For Signal Processing, Circuit For Signal Processing, Chip For Signal Processing, and Electronic Device

#7
20260081572
2026-03-19

NON-LINEAR FUNCTION IN AN EARLY-SAMPLED HYBRID MULTI-LEVEL CONVERTER AMPLIFIER SYSTEM

#8
20260074660
2026-03-12

VOLTAGE GENERATING CIRCUIT

#9
20260005658
2026-01-01

SWITCHING AMPLIFIER CIRCUITRY

#10
20260005657
2026-01-01

Low-EMI capacitively-coupled Class-D amplifiers with voltage boosting

#11
20250385646
2025-12-18

AUDIO AMPLIFIER CIRCUIT FOR DRIVING A SPEAKER

#12
20250293645
2025-09-18

AUDIO AMPLIFICATION SYSTEM AND METHOD THEREOF

#13
20250219601
2025-07-03

CIRCUITS, DEVICES AND METHODS RELATED TO AUDIO AMPLIFIERS HAVING GAIN CALIBRATION

#14
20250219600
2025-07-03

AMPLIFICATION DEVICE AND OPERATION METHOD THEREOF

#15
20250202444
2025-06-19

AUTO-CALIBRATION DRIVING STRENGTH SYSTEM FOR CLASS-D AMPLIFIER

#16
20250167741
2025-05-22

DELAY-LINE METHOD FOR SLEW RATE CONTROL FOR CLASS D DRIVER

#17
20250132656
2025-04-24

PULSE WIDTH MODULATION SIGNAL DRIVER

#18
20250125779
2025-04-17

CLASS-D AMPLIFIER DEVICE FOR HAPTIC APPLICATIONS

#19
20250112600
2025-04-03

POWER-ON AND SHUT-DOWN POP REDUCTION IN AUDIO SYSTEMS

#20
20250088151
2025-03-13

SIGNAL AMPLIFIER

#21
20250048040
2025-02-06

HEARING DEVICE COMPRISING AN AMPLIFIER SYSTEM FOR MINIMIZING VARIATION IN AN ACOUSTICAL SIGNAL CAUSED BY VARIATION IN GAIN OF AN AMPLIFIER

#22
20250047249
2025-02-06

TRIANGLE WAVE GENERATOR CIRCUIT WITH NOISE REDUCTION

#23
20250039621
2025-01-30

Semiconductor Device And Electronic Apparatus

#24
20250030387
2025-01-23

SWITCHING DRIVERS WITH VOLTAGE MONITORING

#25
20250007476
2025-01-02

AUDIO AMPLIFIER CIRCUIT

#26
20240421781
2024-12-19

INTRA-SYMBOL VOLTAGE MODULATION IN A WIRELESS COMMUNICATION CIRCUIT

#27
20240421617
2024-12-19

AUTOMOTIVE INTEGRATED CIRCUIT

#28
20240364281
2024-10-31

CLASS D-H PREAMPLIFIER AND CASCODED HIGH-VOLTAGE AMPLIFIER

#29
20240348214
2024-10-17

DIGITAL AUDIO AMPLIFIER, CHIP, AND ELECTRONIC DEVICE

#30
20240339970
2024-10-10

Audio processing apparatus and method having noise reducing mechanism

#31
20240267008
2024-08-08

AUDIO AMPLIFIER AND METHOD OF OPERATING THE SAME

#32
20240213935
2024-06-27

DYNAMIC PULSE WIDTH CONTROL SCHEME IN AMPLIFIERS

#33
20240205603
2024-06-20

SPEAKER ARRAY ADDRESSED BY ROW AND COLUMN SELECTION

#34
20240186965
2024-06-06

Driving circuit for a switching transistor and a driving device including the same

#35
20240154587
2024-05-09

CLASS-D AUDIO AMPLIFICATION CIRCUITRY AND ELECTRONIC DEVICE INCLUDING THE SAME

#36
20240128933
2024-04-18

CLASS-D AMPLIFIER CIRCUIT

#37
20240088843
2024-03-14

CLASS-D AMPLIFIER WITH NESTED FEEDBACK LOOPS

#38
20240056039
2024-02-15

SWITCHING AMPLIFIER CIRCUITRY

#39
20230412129
2023-12-21

SWITCHING CIRCUIT, CORRESPONDING DEVICE AND METHOD

#40
20230344394
2023-10-26

NON-LINEAR FUNCTION IN AN EARLY-SAMPLED HYBRID MULTI-LEVEL CONVERTER AMPLIFIER SYSTEM

#41
20230336133
2023-10-19

Calibration of pulse width modulation amplifier system

#42
20230327617
2023-10-12

SOUND OUTPUT DEVICE

#43
20230327616
2023-10-12

Class D power amplification modulation system for self-adaptive adjustment of audio signal, method, device, processor and storage medium

#44
20230283968
2023-09-07

Hearing device comprising an amplifier system for minimizing variation in an acoustical signal caused by variation in gain of an amplifier

#45
20230261625
2023-08-17

Switching power supply, semiconductor integrated circuit device, and differential input circuit

#46
20230261620
2023-08-17

Switching amplifier with adaptive supply-voltage scaling

#47
20230261619
2023-08-17

Class-D Amplifier

#48
20230238932
2023-07-27

Audio amplifier with duty ratio control

#49
20230198482
2023-06-22

Audio signal modulation and amplification circuit

#50
20230170856
2023-06-01

Audio amplifer with fast wake-up power supply

#51
20230103164
2023-03-30

Gain calibration for audio amplifiers

#52
20230102992
2023-03-30

Class-D amplifier for reducing audio distortion

#53
20230101927
2023-03-30

CLASS D AMPLIFIER WITH STABILIZED PWM CONTROL LOOP

#54
20230099606
2023-03-30

Switching audio amplifier with improved voltage supply control

#55
20230098492
2023-03-30

PULSE-WIDTH MODULATION AUDIO AMPLIFIER HAVING COMPENSATED REGULATION LOOP

#56
20230095754
2023-03-30

WINDOW CIRCUITS, DEVICES AND METHODS FOR AUDIO AMPLIFIERS

#57
20230093995
2023-03-30

MULTI-LEVEL OUTPUT DRIVER WITH HIGH-VOLTAGE OUTPUT PROTECTION FOR AUDIO AMPLIFIERS

#58
20230069006
2023-03-02

Switching amplifier system with feedback

#59
20230058434
2023-02-23

Class-D amplifier with deadtime distortion compensation

#60
20230017817
2023-01-19

Acoustic Apparatus

#61
20220302912
2022-09-22

BD PWM modulation circuit for use in class D amplifier and modulation method thereof

#62
20220302887
2022-09-22

CLASS-D AMPLIFYING SYSTEM AND POWER CONVERTER CIRCUIT THEREOF

#63
20220302886
2022-09-22

Audio amplifier

#64
20220278658
2022-09-01

Class D amplifier circuitry

#65
20220247371
2022-08-04

Switching power supply, semiconductor integrated circuit device, and differential input circuit

#66
20220224293
2022-07-14

CLASS-D AMPLIFIER, A METHOD OF CONTROLLING A GAIN OF AN INPUT AUDIO SIGNAL IN A CLASS-D AMPLIFIER

#67
20220216836
2022-07-07

Increasing power efficiency in a digital feedback class D driver

#68
20220216835
2022-07-07

CLASS-D AMPLIFIER, A METHOD OF GENERATING A CARRIER WAVE SIGNAL IN A CLASS-D AMPLIFIER

#69
20220190784
2022-06-16

Amplification systems and methods with one or more channels

#70
20220173705
2022-06-02

Compact audio power amplifier

#71
20220166394
2022-05-26

Voltage converter and class-D amplifier

#72
20220158597
2022-05-19

Common-mode leakage error calibration for current sensing in a Class-D stage using a pilot tone

#73
20220094312
2022-03-24

Pulse width modulated amplifier

#74
20220085783
2022-03-17

Clipping state detecting circuit and clipping state detecting method

#75
20220069711
2022-03-03

Transconductance amplifier for buck-boost converter

#76
20220045656
2022-02-10

Class-D amplifier with nested feedback loops

#77
20220045655
2022-02-10

Class-D amplifier which can suppress differential mode power noise

#78
20210391856
2021-12-16

Modulator circuit, corresponding device and method

#79
20210384873
2021-12-09

Audio output device

#80
20210367567
2021-11-25

Time encoding modulator circuitry

#81
20210351751
2021-11-11

Common-mode leakage error calibration for current sensing in a class-D stage using a pilot tone

#82
20210337321
2021-10-28

Hearing device comprising an amplifier system for minimizing variation in an acoustical signal caused by variation in gain of an amplifier

#83
20210320631
2021-10-14

Audio power source with improved efficiency

#84
20210265960
2021-08-26

METHOD FOR GENERATING FULLY DIGITAL HIGH-RESOLUTION FEEDBACK PWM SIGNAL

#85
20210265959
2021-08-26

Low pop-click noise class-D amplifier

#86
20210257978
2021-08-19

Switching power supply, semiconductor integrated circuit device, and differential input circuit

#87
20210083627
2021-03-18

HIGH-FREQUENCY AMPLIFIER

#88
20210067097
2021-03-04

Envelope tracking supply modulator for power amplifier

#89
20210044285
2021-02-11

PWM modulator having quantizer calibratable for multi-non-ideal gain-affecting characteristics

#90
20210044265
2021-02-11

Distortion reducing variable output impedance class-D amplifier

#91
20210044264
2021-02-11

Class-D amplifier with multiple power rails and quantizer that switches used ramp amplitude concurrently with switch in used power rail

#92
20210006215
2021-01-07

Device and method for a wireless transmitter

#93
20200395903
2020-12-17

Power amplifier and demodulator

#94
20200395900
2020-12-17

Three level PWM class D amplifier

#95
20200382063
2020-12-03

Amplifier switching control systems and methods

#96
20200350877
2020-11-05

Integrated circuit and related audio amplifier

#97
20200295719
2020-09-17

Amplification apparatus and transmission apparatus

#98
20200280306
2020-09-03

Signal modulator

#99
20200228076
2020-07-16

Digital-to-analog converter and amplifier for headphones

#100
20200213778
2020-07-02

Hearing device comprising an amplifier system for minimizing variation in an acoustical signal caused by variation in gain of an amplifier

#101
20200204130
2020-06-25

Amplification systems and methods with output regulation

#102
20200144996
2020-05-07

Pulse-width modulation

#103
20200136574
2020-04-30

Audio power source with improved efficiency

#104
20200129776
2020-04-30

Implantable cardioverter defibrillators using high power amplifiers with impedance tracking lowpass filters

#105
20200119725
2020-04-16

Chopped triangular wave PWM quantizer

#106
20200119702
2020-04-16

PWM modulator having quantizer with controllable analog gain and calibratable for multi-non-ideal gain-affecting characteristics

#107
20200091877
2020-03-19

Audio processing device and method for controlling audio processing device

#108
20200083851
2020-03-12

Audio processing device and method for controlling audio processing device

#109
20200067461
2020-02-27

Audible noise reduction in an audio power amplifier

#110
20200044616
2020-02-06

Variable output resistance in a playback path with open-loop pulse-width modulation driver

#111
20200036352
2020-01-30

Gain control in a class-D open-loop amplifier

#112
20200036348
2020-01-30

Class-D dynamic closed loop feedback amplifier

#113
20200004281
2020-01-02

Differential controller with regulators

#114
20190348951
2019-11-14

Amplification systems and methods with one or more channels

#115
20190341894
2019-11-07

Power amplifier, radio remote unit, and base station

#116
20190319585
2019-10-17

DYNAMIC ERROR VECTOR MAGNITUDE DUTY CYCLE CORRECTION

#117
20190319536
2019-10-17

Switching regulator

#118
20190312557
2019-10-10

WIDE-BAND AMPLIFIERS USING CLIPPER CIRCUITS FOR REDUCED HARMONICS

#119
20190296696
2019-09-26

Digital amplifier and output device

#120
20190288652
2019-09-19

Quaternary/ternary modulation selecting circuit and associated method

#121
20190245498
2019-08-08

Integrated circuit and related audio amplifier

#122
20190245494
2019-08-08

Power amplifier

#123
20190222182
2019-07-18

Class D amplifier

#124
20190214951
2019-07-11

Audio power source with improved efficiency

#125
20190214947
2019-07-11

Audio power source with improved efficiency

#126
20190207570
2019-07-04

High-efficiency power amplifier system for wireless power transmitters

#127
20190158049
2019-05-23

Class-D amplifier with duty cycle control

#128
20190149107
2019-05-16

Low power dissipation high performance Class-D amplifier

#129
20190149101
2019-05-16

Class-D amplifier with multiple independent output stages

#130
20190149096
2019-05-16

Closed-loop digital compensation scheme

#131
20190141811
2019-05-09

Driving apparatus for a light emitting device and method for the same

#132
20190137580
2019-05-09

Circuit arrangement for an MRT system, MRT system and method for operating an MRT system

#133
20190123694
2019-04-25

Methods and circuits to reduce pop noise in an audio device

#134
20190123653
2019-04-25

Body-diode conduction detector for adaptive controlling of the power stage of power converters

#135
20190115886
2019-04-18

Calibration of a dual-path pulse width modulation system

#136
20190103862
2019-04-04

Pulse-width modulation

#137
20190081621
2019-03-14

Digital audio converter and amplifier controller

#138
20190069087
2019-02-28

Direct current mode digital-to-analog converter to class D amplifier

#139
20190044487
2019-02-07

Class-D amplifier and audio playback apparatus

#140
20190028069
2019-01-24

Digital amplifier

#141
20190007010
2019-01-03

Class D audio amplifier with overload protection circuit

#142
20190007009
2019-01-03

Amplifier circuit

#143
20190007008
2019-01-03

Circuit for generating a plurality of reference voltages for controlling feedback within the circuit

#144
20180337637
2018-11-22

Class-H switching amplifier circuit having supply voltage proportional to an audio signal

#145
20180331660
2018-11-15

Class D audio amplifier with adjustable gate drive

#146
20180294780
2018-10-11

Wide-band amplifiers using clipper circuits for reduced harmonics

#147
20180287595
2018-10-04

Power amplifying apparatus with spurious signal reduction function

#148
20180287574
2018-10-04

Signal amplifier

#149
20180278217
2018-09-27

Amplifier, audio signal output method, and electronic device

#150
20180262192
2018-09-13

Driver Interface Methods and Apparatus for Switch-Mode Power Converters, Switch-Mode Power Amplifiers, and Other Switch-Based Circuits

#151
20180254757
2018-09-06

Digital PWM modulator

#152
20180242419
2018-08-23

Driving apparatus for a light emitting device and method for the same

#153
20180241354
2018-08-23

Method for load measurement in switching amplifiers, corresponding device and amplifier

#154
20180234062
2018-08-16

Triangular-wave voltage generator and corresponding class-D amplifier circuit

#155
20180226926
2018-08-09

Class D amplifier

#156
20180212570
2018-07-26

Closed-loop digital compensation scheme

#157
20180210048
2018-07-26

Gradient amplifier and drive circuit thereof

#158
20180198414
2018-07-12

Automatic bias controller for a pulsed power amplifier

#159
20180196457
2018-07-12

Regenerative current detection circuit, charge current detection circuit, and motor current detection system

#160
20180191315
2018-07-05

Class-D amplifier with post filter feedback loop

#161
20180176683
2018-06-21

Direct current mode digital-to-analog converter to class D amplifier

#162
20180175812
2018-06-21

Multi-level class D amplifier

#163
20180159488
2018-06-07

Amplifier with configurable final output stage

#164
20180138861
2018-05-17

Dynamic error vector magnitude duty cycle correction

#165
20180091102
2018-03-29

Amplifier with configurable final output stage

#166
20180076806
2018-03-15

PWM modulator

#167
20180076781
2018-03-15

Class-D amplifier circuit

#168
20180062593
2018-03-01

Class-D amplifier circuits

#169
20180062584
2018-03-01

Amplifier

#170
20180048276
2018-02-15

Multi-mode envelope tracking amplifier circuit

#171
20180041173
2018-02-08

Configurable control loop topology for a pulse width modulation amplifier

#172
20180020288
2018-01-18

Direct current mode digital-to-analog converter to class D amplifier

#173
20170373655
2017-12-28

High frequency common mode rejection technique for large dynamic common mode signals

#174
20170359060
2017-12-14

Driver interface methods and apparatus for switch-mode power converters, switch-mode power amplifiers, and other switch-based circuits

#175
20170302232
2017-10-19

Class D amplifier

#176
20170294888
2017-10-12

Audio amplifier system

#177
20170279422
2017-09-28

BTL OUTPUT SELF-OSCILLATING CLASS D AMPLIFIER

#178
20170279421
2017-09-28

Self-oscillating class D amplifier

#179
20170279420
2017-09-28

Audio signal amplification device, power supply device, and power supply control method

#180
20170272045
2017-09-21

Estimating voltage on speaker terminals driven by a class-D amplifier

#181
20170264254
2017-09-14

AMPLIFIER CONTROL APPARATUS

#182
20170250655
2017-08-31

Dynamic volume management in audio amplifiers

#183
20170250654
2017-08-31

DYNAMIC DEAD TIME MANAGEMENT

#184
20170234950
2017-08-17

Circuit arrangement, gradient amplifier, and method for compensating for nonlinearities of an amplifier output stage

#185
20170230020
2017-08-10

Class D switching amplifier and method of controlling a loudspeaker

#186
20170230018
2017-08-10

Receiver circuit and system using the same

#187
20170230016
2017-08-10

Electric power converter and power amplifier

#188
20170223796
2017-08-03

Driving apparatus for a light emitting device and method for the same

#189
20170212546
2017-07-27

Voltage-current converter, and corresponding device and method

#190
20170207759
2017-07-20

Hybrid switched mode amplifier

#191
20170207750
2017-07-20

Very high fidelity audio amplifier

#192
20170194922
2017-07-06

Amplification systems and methods with output regulation

#193
20170194915
2017-07-06

Envelope tracking modulator with feedback

#194
20170170794
2017-06-15

Class E2 amplifier

#195
20170164995
2017-06-15

Radio frequency generator and a method of generating radio frequency energy utilizing the radio frequency generator

#196
20170149403
2017-05-25

Class-D amplifier, audio processing apparatus and method of driving class-D amplifier

#197
20170141743
2017-05-18

Speaker driver

#198
20170093348
2017-03-30

Methods and circuits to reduce pop noise in an audio device

#199
20170077882
2017-03-16

Class-D amplifier with pulse-width modulation common-mode control and associated method for performing class-D amplification

#200
20170070200
2017-03-09

Dead time circuit for a switching circuit and a switching amplifier

#201
20170055076
2017-02-23

Reduced crosstalk class D audio amplifier matching output power based on channel gain

#202
20170054422
2017-02-23

Reduced crosstalk and matched output power audio amplifier using a triangle wave generator

#203
20170054421
2017-02-23

Method for delivering a duty cycle limited signal to a speaker using a class D amplifier

#204
20170054420
2017-02-23

Reduced crosstalk and matched output power class D audio amplifier with oppositely polarized triangle waves

#205
20170054416
2017-02-23

Class-D audio amplifier

#206
20170047902
2017-02-16

Switch control method, switch control circuit, regulator and storage medium

#207
20170047895
2017-02-16

Systems and methods for dynamic range enhancement using an open-loop modulator in parallel with a closed-loop modulator

#208
20170040902
2017-02-09

Switching mode power amplifier with load isolation

#209
20170033811
2017-02-02

Supply modulators with voltage and frequency partitioning

#210
20170033746
2017-02-02

Dynamic error vector magnitude duty cycle correction

#211
20170033743
2017-02-02

Outphasing transmitter systems and methods

#212
20170019079
2017-01-19

Class-D amplifier circuits

#213
20170019073
2017-01-19

Signal amplifying circuit with noise suppression function

#214
20170013358
2017-01-12

Class D amplifier chip with duty ratio limiting functions and the device thereof

#215
20170005629
2017-01-05

Average power tracking mode power amplifier using dual bias voltage levels

#216
20160380600
2016-12-29

Bootstrap class-D wideband RF power amplifier

#217
20160380597
2016-12-29

Envelope tracking power converter

#218
20160373076
2016-12-22

Average current-mode feedback control of multi-channel class-D audio amplifier

#219
20160373073
2016-12-22

Semiconductor integrated circuit

#220
20160344348
2016-11-24

Amplification systems and methods with one or more channels

#221
20160336778
2016-11-17

Apparatus for performing multi-loop power control in an electronic device with aid of analog compensation and duty cycle selection, and associated method

#222
20160323669
2016-11-03

Audio signal amplification device

#223
20160299519
2016-10-13

Zero drift, limitless and adjustable reference voltage generation

#224
20160294587
2016-10-06

Open loop digital PWM envelope tracking system with dynamic boosting

#225
20160294337
2016-10-06

Power supply rejection rate through noise cancellation in an audio amplifier loop

#226
20160294326
2016-10-06

Class-D amplifier

#227
20160268984
2016-09-15

Quaternary/ternary modulation selecting circuit and associated method

#228
20160248391
2016-08-25

Amplification circuit adjusting duty cycle of output signal and receiver including the same

#229
20160248381
2016-08-25

Power amplification device and method

#230
20160233832
2016-08-11

Switching regulator power supply with constant current option

#231
20160226453
2016-08-04

Wireless apparatus and method for controlling voltage supplied to amplifier unit

#232
20160226451
2016-08-04

Circuits and methods for switched-mode operational amplifiers

#233
20160218703
2016-07-28

Multiphase pulse width modulator for class D audio amplifiers

#234
20160211811
2016-07-21

Current limiter

#235
20160211809
2016-07-21

Method of generating a pulse width modulation (PWM) signal for an analog amplifier, and a related pulse width modulator

#236
20160197587
2016-07-07

Power amplifiers coupled in series

#237
20160181988
2016-06-23

Methods and circuits to reduce pop noise in an audio device

#238
20160142018
2016-05-19

POWER MOSFETS WITH IMPROVED EFFICIENCY FOR MULTI-CHANNEL CLASS D AUDIO AMPLIFIERS AND PACKAGING THEREFOR

#239
20160134446
2016-05-12

System and method for linearizing power amplifiers

#240
20160134268
2016-05-12

PWM modulation device and sound signal output apparatus

#241
20160134239
2016-05-12

Class D power driver peripheral

#242
20160126907
2016-05-05

Amplifier control apparatus

#243
20160118949
2016-04-28

Amplifier with adjustable ramp up/down gain for minimizing or eliminating pop noise

#244
20160118948
2016-04-28

Systems and methods for dynamic range enhancement using an open-loop modulator in parallel with a closed-loop modulator

#245
20160099693
2016-04-07

SWITCHING AMPLIFIER AND CONTROL METHOD THEREFOR

#246
20160094188
2016-03-31

Power amplifying apparatus and power amplifying method

#247
20160079939
2016-03-17

Resonant pre-driver for switching amplifier

#248
20160079938
2016-03-17

Modulation method for switching modulator

#249
20160065134
2016-03-03

Asymmetric H-bridge in a class D power amplifier

#250
20160056770
2016-02-25

Radio-frequency high power amplifier with broadband envelope tracking by means of reversed buck converter

#251
20160043696
2016-02-11

Class D switching amplifier and method of controlling a loudspeaker

#252
20160020735
2016-01-21

Power amplifier

#253
20160011242
2016-01-14

Capacitive current sensing using a current feedback amplifier

#254
20160006402
2016-01-07

Edge correction to mitigate total harmonic distortion in class D amplifier

#255
20150381119
2015-12-31

Audio switching amplifier

#256
20150378386
2015-12-31

Trans-conductance regulation circuit, trans-conductance error amplifier and power converter

#257
20150365059
2015-12-17

Class-D amplifier and electronic apparatus

#258
20150356963
2015-12-10

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