ClassID:

219627

H03F2200/393 - CPC Classification

Classification description:

Indexing scheme relating to amplifiers A measuring circuit being coupled to the output of an amplifier

Recent Application in this class:
#1
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

#2
20240120896
2024-04-11

DIFFERENTIAL AMPLIFIER CIRCUIT

#3
20230308053
2023-09-28

Dynamically biased power amplification

#4
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

#5
20230082905
2023-03-16

RADIO FREQUENCY POWER AMPLIFIER

#6
20220200534
2022-06-23

Dynamically biased power amplification

#7
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

#8
20210305950
2021-09-30

Power amplifier evaluation method and measurement system

#9
20210075384
2021-03-11

Apparatus and method for measuring speaker transducer impedance versus frequency with ultralow inaudible signal

#10
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

#11
20200132726
2020-04-30

Test and measurement instrument having overpulsed power supply and controlled slew rate

#12
20200052654
2020-02-13

Apparatus and method for assisting envelope tracking with transient response in supply voltage for power amplifier

#13
20200052653
2020-02-13

Amplifier, circuit for trimming a bias voltage, method for amplifying an input signal and method for trimming a bias voltage

#14
20190207570
2019-07-04

High-efficiency power amplifier system for wireless power transmitters

#15
20190207561
2019-07-04

Amplifying device comprising a compensation circuit

#16
20190207560
2019-07-04

Dynamically biased power amplification

#17
20190204360
2019-07-04

Electronic amplification device, measurement apparatus and associated measurement method

#18
20190131939
2019-05-02

Adjustable load line power amplifier circuits and methods

#19
20180358941
2018-12-13

Capacitive loading mode measurement circuit with compensation of measurement errors due to parasitic sensor impedances

#20
20180342993
2018-11-29

Sensing circuit, corresponding amplifier, apparatus and method

#21
20180241354
2018-08-23

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

#22
20170373767
2017-12-28

Wireless device with a multi-turn directional coupler

#23
20170160316
2017-06-08

Class D audio amplifier and method for reading a current supplied by the amplifier

#24
20170141748
2017-05-18

Amplifier system, controller of main amplifier and associated control method

#25
20170141743
2017-05-18

Speaker driver

#26
20170019070
2017-01-19

Power controllable wireless communication device

#27
20160359216
2016-12-08

Integrated directional coupler within an RF matching network

#28
20160329870
2016-11-10

Digital amplitude modulation device and digital amplitude modulation control method

#29
20160308494
2016-10-20

Power amplifier device with controlled envelope tracking modulator and adapted static voltage

#30
20160294336
2016-10-06

Balanced differential transimpedance amplifier with single ended input and balancing method

#31
20160278028
2016-09-22

Power adjustment method, computer-readable recording medium and power adjustment apparatus

#32
20150371770
2015-12-24

Broadband power amplifier having high efficiency

#33
20150349717
2015-12-03

Amplifier circuit with improved accuracy

#34
20150244331
2015-08-27

Microwave power amplification apparatus and method thereof

#35
20150198893
2015-07-16

AMPLIFICATION APPARATUS, ANTI-VIBRATION APPARATUS, LITHOGRAPHY APPARATUS, AND ARTICLE MANUFACTURING METHOD

#36
20150145605
2015-05-28

Wireless communication device

#37
20150130483
2015-05-14

Differential amplifier design as the preamp of DMM

#38
20150042405
2015-02-12

Power detection circuit and RF signal amplification circuit having the same

#39
20140118064
2014-05-01

Electronic radio system for power amplification with protection in terms of standing wave rate and associated method of protection

#40
20130321075
2013-12-05

Method for compensating signal distortions in composite amplifiers

#41
20130307635
2013-11-21

Integrated directional coupler within an RF matching network

#42
20130241640
2013-09-19

Reconfigurable input power distribution doherty amplifier with improved efficiency

#43
20130021094
2013-01-24

Circuit for optimizing a power management system during varying load conditions

#44
20120308050
2012-12-06

Efficiency optimizer of an audio power amplifier for car radio

#45
20120262064
2012-10-18

Radio frequency power delivery system

#46
20120223776
2012-09-06

Power supply controller for a multi-gain step RF power amplifier

#47
20120098601
2012-04-26

Amplifying circuit

#48
20120088510
2012-04-12

Wireless transceiver with amplifier bias adjusted based on modulation scheme and transmit power feedback

#49
20120001693
2012-01-05

Power amplifier amplitude modulator system and method

#50
20110279179
2011-11-17

Apparatus and method for controlling power amplifier

#51
20110230149
2011-09-22

RF power amplifier device and wireless communication terminal device

#52
20110170713
2011-07-14

Amplification apparatus

#53
20110136450
2011-06-09

POWER CIRCUIT AND RADIO COMMUNICATION CIRCUIT USING SAME AND METHOD OF OPERATING A CIRCUIT

#54
20110121894
2011-05-26

APPARATUS AND METHOD FOR POWER ADDED EFFICIENCY OPTIMIZATION OF HIGH AMPLIFICATION APPLICATIONS

#55
20110095827
2011-04-28

Radio frequency (RF) power amplifier and RF power amplifier apparatus

#56
20100237948
2010-09-23

System and method for dynamic drain voltage adjustment to control linearity, output power, and efficiency in RF power amplifiers

#57
20090298446
2009-12-03

Distortion compensating apparatus, wireless communicating apparatus, and distortion compensating method

#58
20090289717
2009-11-26

Radio frequency (RF) power amplifier and RF power amplifier apparatus

#59
20090189449
2009-07-30

Power source and method for controlling operational power

#60
20090163156
2009-06-25

DAC based switching power amplifier

#61
20090163154
2009-06-25

Method for compensating signal distortions in composite amplifiers

#62
20090153246
2009-06-18

Method and system for varying gain exponentially with respect to a control signal

#63
20090091391
2009-04-09

Configurable feedback for an amplifier

#64
20090052590
2009-02-26

LAYERED MODULATION FOR DIGITAL SIGNALS

#65
20090041268
2009-02-12

Signal amplifying apparatus, amplification system, and signal amplification method

#66
20090021300
2009-01-22

Apparatus and Method for Detecting Output Power From an Amplifier

#67
20090015324
2009-01-15

Power amplifier amplitude modulator system and method

#68
20080297171
2008-12-04

TRANSCEIVER SYSTEM THAT ESTIMATES A VOLTAGE STANDING WAVE RATIO

#69
20080290947
2008-11-27

Reconfigurable tunable RF power amplifier

#70
20080284520
2008-11-20

System and method for power detection in a power amplifier

#71
20080284519
2008-11-20

Apparatus and method for power added efficiency optimization of high amplification applications

#72
20080280573
2008-11-13

Linear RF amplifier with polar feedback

#73
20080232436
2008-09-25

Average power control of wireless transmission having a variable duty cycle

#74
20080224767
2008-09-18

Semiconductor integrated circuit and method for adjusting a capacitance value of a phase compensating capacitor

#75
20080211583
2008-09-04

System and method for dynamic drain voltage adjustment to control linearity, output power, and efficiency in RF power amplifiers

#76
20080180177
2008-07-31

Methods and apparatus to detect impedance at an amplifier output

#77
20080179948
2008-07-31

RADIO FREQUENCY POWER DELIVERY SYSTEM

#78
20080174356
2008-07-24

Wave detector circuit

#79
20080164944
2008-07-10

PROTECTION AND AUTOMATIC RECOVERY CIRCUIT SYSTEM

#80
20080125061
2008-05-29

RF power amplifying device and wireless communication terminal device

#81
20080063112
2008-03-13

Method for avoiding interference radiation of AM transmitters used in digital transmission

#82
20080054999
2008-03-06

Input offset voltage corrector

#83
20080037807
2008-02-14

Protected digital audio driver

#84
20080036470
2008-02-14

Inverse characteristic measuring apparatus, distortion compensation apparatus, method, program, and recording medium

#85
20070298734
2007-12-27

Systems, methods, and apparatuses for linear polar transmitters

#86
20070296504
2007-12-27

Integrated implementation of a voltage boost follower and method therefor

#87
20070296493
2007-12-27

Enhanced digital predistortion

#88
20070290753
2007-12-20

Method and system for varying gain exponentially with respect to a control signal

#89
20070275676
2007-11-29

DAC based switching power amplifier

#90
20070222513
2007-09-27

Apparatus and method for processing of amplifier linearization signals

#91
20070173213
2007-07-26

Cartesian loop transmitter and method of adjusting an output level of such transmitter

#92
20070154021
2007-07-05

Digital feedback to improve the sound reproduction of an electro-dynamic loudspeaker

#93
20070153936
2007-07-05

Digitally convertible radio

#94
20070116156
2007-05-24

Layered modulation for digital signals

#95
20070098190
2007-05-03

Method and apparatus to control output power of a digital power amplifier optimized to a headphone and a portable audio player having the same

#96
20070063736
2007-03-22

Soft-start circuit and method for power-up of an amplifier circuit

#97
20070057729
2007-03-15

Power amplifier and wireless communication device

#98
20070041470
2007-02-22

Transmitter control

#99
20060279359
2006-12-14

High-frequency power amplifier circuit and electronic part for communication

#100
20060215293
2006-09-28

Method of verifying preamplifier circuit functions, and magnetic record regeneration apparatus using the same

#101
20050218989
2005-10-06

High-frequency power amplifier circuit and electronic part for communication

#102
20050078778
2005-04-14

Coherent averaging for measuring traveling wave tube amplifier nonlinearity