ClassID:

219560

H03F2200/211 - CPC Classification

Classification description:

Indexing scheme relating to amplifiers the input of an amplifier can be attenuated by a continuously controlled transistor attenuator

Recent Application in this class:
#1
20250373208
2025-12-04

Current limiting apparatus for driving a loudspeaker

#2
20250175128
2025-05-29

POWER AMPLIFIER

#3
20250088159
2025-03-13

CURRENT SENSE AMPLIFIER

#4
20240429878
2024-12-26

MULTI-PATH AMPLIFICATION CIRCUIT FOR OPERATING IN DIFFERENT POWER MODES

#5
20240405732
2024-12-05

HIGH FREQUENCY CIRCUIT AND COMMUNICATION APPARATUS

#6
20240204738
2024-06-20

MULTI-MODE POWER AMPLIFYING APPARATUS

#7
20230097399
2023-03-30

High linearity modes in wireless receivers

#8
20230082905
2023-03-16

RADIO FREQUENCY POWER AMPLIFIER

#9
20210288621
2021-09-16

Chopper stabilized attenuation for sense amplifiers

#10
20210111685
2021-04-15

Multi-input amplifier with individual bypass paths

#11
20210058043
2021-02-25

Power amplifier circuit, semiconductor device, and method for manufacturing semiconductor device

#12
20200195212
2020-06-18

Amplifying signals using compensating impedances to improve return loss and mismatch over gain modes

#13
20200014334
2020-01-09

Power amplification circuit

#14
20200007102
2020-01-02

Multi-input amplifier with variable gain for individual inputs

#15
20190267953
2019-08-29

INTEGRATED RF LIMITER

#16
20190263712
2019-08-29

Process of using a submerged combustion melter to produce hollow glass fiber or solid glass fiber having entrained bubbles, and burners and systems to make such fibers

#17
20190253025
2019-08-15

Amplifier linearization and related apparatus thereof

#18
20190230132
2019-07-25

Access control to a voice service by a wireless access point

#19
20190229692
2019-07-25

Audio signal processor and method of processing audio signal

#20
20190190476
2019-06-20

Power amplifier circuit

#21
20190190455
2019-06-20

Transmission unit

#22
20190089319
2019-03-21

Ultrafast and precise gain control step in RF amplifiers

#23
20190068139
2019-02-28

System and method for low distortion capacitive signal source amplifier

#24
20190007006
2019-01-03

Radio frequency switch apparatus with improved harmonic attenuation characteristics

#25
20180358935
2018-12-13

Total harmonic distortion (THD) controlled clip detector and automatic gain limiter (AGL)

#26
20180206034
2018-07-19

Method for limiting amplifier input current to avoid low voltage conditions

#27
20180175807
2018-06-21

LNA with programmable linearity

#28
20180152158
2018-05-31

Attenuator device in a radio frequency transmission stage

#29
20180152145
2018-05-31

Power amplification circuit

#30
20180123538
2018-05-03

Source follower based envelope tracking for power amplifier biasing

#31
20180062600
2018-03-01

Multi-input amplifier with programmable embedded attenuators

#32
20180062598
2018-03-01

Multi-input amplifier with improved return loss and mismatch over gain modes

#33
20180034428
2018-02-01

Adjustable gain power amplifier, gain adjustment method and mobile terminal

#34
20180019714
2018-01-18

Integrated RF limiter

#35
20170201827
2017-07-13

Headphone driver, a sound system that incorporates the headphone driver and a computing system that incorporates the headphone driver

#36
20160294335
2016-10-06

Radiofrequency power limiter, and associated radiofrequency emitter and/or receiver chain and low-noise amplifying stage

#37
20160211806
2016-07-21

Semiconductor integrated circuit and wireless transmitter

#38
20160164493
2016-06-09

High frequency attenuator

#39
20160065152
2016-03-03

System and method for low distortion capacitive signal source amplifier

#40
20160028500
2016-01-28

Communication device, reception power monitoring device, and communication device system

#41
20150288338
2015-10-08

Power amplifier circuit capable of adjusting gain dynamically

#42
20140062600
2014-03-06

Temperature compensation circuit and electronic device with temperature compensation

#43
20130127540
2013-05-23

Power amplifier

#44
20130051582
2013-02-28

System and method for low distortion capacitive signal source amplifier

#45
20130040586
2013-02-14

System and method for improving power efficiency of a transmitter

#46
20120326781
2012-12-27

Transmission module and phased array antenna apparatus

#47
20120281325
2012-11-08

Limiting circuit

#48
20120206205
2012-08-16

Variable gain amplifier

#49
20120154055
2012-06-21

Power amplifier

#50
20110133868
2011-06-09

Thermometer coded attenuator

#51
20110025421
2011-02-03

Step variable gain amplifier

#52
20100327998
2010-12-30

Thermometer coded attenuator

#53
20100156541
2010-06-24

Semiconductor device

#54
20100007418
2010-01-14

Input system for a variable gain amplifier having class-AB transconductance stages

#55
20100001801
2010-01-07

Intermodulation signal generator of power amplifier and pre-distortion linearizer having the same

#56
20090302948
2009-12-10

Post amplifier with selectable gain

#57
20090213276
2009-08-27

Receiver having a gain-controllable input stage

#58
20090196437
2009-08-06

Muting control device, muting control method, and muting control program

#59
20090036065
2009-02-05

Transmit/receive switch

#60
20080311867
2008-12-18

MOS RESISTANCE CONTROLLING DEVICE, MOS ATTENUATOR AND RADIO TRANSMITTER

#61
20080297259
2008-12-04

Configurable, variable gain LNA for multi-band RF receiver

#62
20080290951
2008-11-27

Semiconductor device

#63
20080218269
2008-09-11

Power amplifier circuit, control method thereof and control program thereof

#64
20080150632
2008-06-26

Gigabit ethernet transceiver with analog front end

#65
20080044041
2008-02-21

Energy-efficient consumer device audio power output stage

#66
20070290757
2007-12-20

Input system for a variable gain amplifier having class-AB transconductance stages

#67
20070216482
2007-09-20

High linearity and low noise amplifier with continuously variable gain control

#68
20070173213
2007-07-26

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

#69
20070161359
2007-07-12

Amplifier with improved noise performance and extended gain control range

#70
20070104493
2007-05-10

Optical receiver preamplifier

#71
20060238256
2006-10-26

Gigabit ethernet transceiver with analog front end

#72
20060238254
2006-10-26

Input system for a variable gain amplifier having class-AB transconductance stages

#73
20060202755
2006-09-14

Gigabit ethernet transceiver with analog front end

#74
20060192614
2006-08-31

Gigabit ethernet transceiver with analog front end

#75
20060077102
2006-04-13

Wafer scale beam forming antenna module with distributed amplification

#76
20050189993
2005-09-01

Gigabit Ethernet transceiver with analog front end

#77
20050057304
2005-03-17

Single-ended input, differential output low noise amplifier

#78
13652939
2015-08-18

Energy-efficient consumer device audio power output stage