ClassID:

219622

H03F2200/381 - CPC Classification

Classification description:

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

Recent Application in this class:
#1
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DYNAMICALLY-TUNABLE AMPLIFIER

#2
20260113000
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RADIO FREQUENCY CIRCUIT, RADIO FREQUENCY MODULE, AND AMPLIFICATION METHOD

#3
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TRACKER CIRCUIT, INTEGRATED CIRCUIT, AND AMPLIFICATION METHOD

#4
20250038721
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DUAL OUTPUT AMPLIFIER FOR PRECISION RESISTOR CALIBRATION SYSTEM

#5
20240113664
2024-04-04

CASCODE GAIN BOOSTING AND LINEAR GAIN CONTROL USING GATE RESISTOR

#6
20230145951
2023-05-11

Cascode gain boosting and linear gain control using gate resistor

#7
20220021347
2022-01-20

Cascode gain boosting and linear gain control using gate resistor

#8
20220006427
2022-01-06

Amplifier circuit and amplifier device

#9
20210297049
2021-09-23

Variable gain amplifier and wireless communication device

#10
20200044616
2020-02-06

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

#11
20180335454
2018-11-22

Current sensing in a USB power control analog subsystem

#12
20180287571
2018-10-04

Power amplification module

#13
20180097490
2018-04-05

Circuit and method for a high common mode rejection amplifier by using a digitally controlled gain trim circuit

#14
20170310287
2017-10-26

Power amplification module

#15
20170141737
2017-05-18

Apparatus and method for dynamically biased baseband current amplifier

#16
20160190998
2016-06-30

Amplifier circuit

#17
20160072447
2016-03-10

Apparatus and method for dynamically biased baseband current amplifier

#18
20150002228
2015-01-01

Amplifier with improved noise reduction

#19
20130099797
2013-04-25

Variable impedance device

#20
20130002348
2013-01-03

Amplifier with improved noise reduction

#21
20100156541
2010-06-24

Semiconductor device

#22
20100156540
2010-06-24

Amplifier architecture for polar modulation

#23
20090135524
2009-05-28

Magnetic head driving circuit with protection function

#24
20080290951
2008-11-27

Semiconductor device

#25
20080119153
2008-05-22

Multiband wireless device and semiconductor integrated circuit

#26
20070262813
2007-11-15

Filter calibration with cell re-use

#27
20070228257
2007-10-04

Trans-impedance amplifier with offset current

#28
20070132512
2007-06-14

Variable gain amplifier

#29
20070126501
2007-06-07

Variable gain amplifier and variable gain amplifier module