ClassID:

219544

H03F2200/168 - CPC Classification

Classification description:

Indexing scheme relating to amplifiers Two amplifying stages are coupled by means of a filter circuit

Recent Application in this class:
#1
20260142621
2026-05-21

LOW NOISE AMPLIFIER OPERATING IN X-BAND AND KU-BAND

#2
20260044225
2026-02-12

SENSOR DEVICE AND DRIVING METHOD THEREOF

#3
20260012139
2026-01-08

POWER AMPLIFIER CIRCUIT

#4
20250211183
2025-06-26

INSTRUMENTATION AMPLIFIER AND SIGNAL DETECTION SYSTEM

#5
20250211181
2025-06-26

POWER AMPLIFIER CIRCUIT

#6
20250202446
2025-06-19

DIFFERENTIAL AMPLIFIER

#7
20250202430
2025-06-19

TRACKER CIRCUIT AND TRACKING METHOD

#8
20250047253
2025-02-06

TRANSIMPEDANCE AMPLIFIER

#9
20240364281
2024-10-31

CLASS D-H PREAMPLIFIER AND CASCODED HIGH-VOLTAGE AMPLIFIER

#10
20240275334
2024-08-15

MULTI-LEVEL ENVELOPE TRACKING SYSTEMS WITH SEPARATE DC AND AC PATHS

#11
20240243713
2024-07-18

CIRCUIT AND METHOD FOR MEASURING AND CORRECTING SIGNAL OFFSET AT TWO POINTS

#12
20240235500
2024-07-11

DIGITAL COMPENSATION SYSTEM FOR A RADIO FREQUENCY POWER AMPLIFIER MODULE

#13
20240146253
2024-05-02

Inductive interface circuits having ripple-reduction loops

#14
20230291356
2023-09-14

Multi-level envelope tracking with analog interface

#15
20230176668
2023-06-08

Sensor device and driving method thereof

#16
20220385250
2022-12-01

Fast start up control circuit

#17
20220352859
2022-11-03

POWER AMPLIFIER MODULE

#18
20220311401
2022-09-29

Superconducting output amplifiers with interstage filters

#19
20220224298
2022-07-14

Transimpedance amplifier

#20
20220182025
2022-06-09

Output matching circuit and power amplifier circuit

#21
20220140789
2022-05-05

Filter combiner for a Doherty amplifier, and a Doherty amplifier

#22
20220123698
2022-04-21

Power amplifier circuit

#23
20220109404
2022-04-07

Power amplifier bias modulation for low bandwidth envelope tracking

#24
20220103143
2022-03-31

Power amplification circuit

#25
20220085766
2022-03-17

Multi-level envelope tracking with analog interface

#26
20220085764
2022-03-17

Multi-level envelope tracking systems with separate DC and AC paths

#27
20220077826
2022-03-10

Distributed conversion of digital data to radio frequency

#28
20210344313
2021-11-04

Digital compensation system for a radio frequency power amplifier module

#29
20210344311
2021-11-04

Class D amplifiers

#30
20210273665
2021-09-02

Apparatus and method for amplifying transmission signals in wireless communication system

#31
20210194441
2021-06-24

Gain compression compensation circuit of radio frequency power amplifier

#32
20210159860
2021-05-27

Apparatus and methods for low noise amplifiers with mid-node impedance networks

#33
20210145302
2021-05-20

EMG device

#34
20210119591
2021-04-22

Architecture of radio frequency front-end

#35
20210099136
2021-04-01

Power amplifier bias modulation for low bandwidth envelope tracking

#36
20210099135
2021-04-01

Multi-level envelope tracking with analog interface

#37
20210099134
2021-04-01

Multi-level envelope tracking systems with separate DC and AC paths

#38
20210099133
2021-04-01

Power amplifier bias modulation for multi-level supply envelope tracking

#39
20210013837
2021-01-14

Multiple-stage power amplifiers implemented with multiple semiconductor technologies

#40
20200395899
2020-12-17

Chopper-stabilized current feedback amplifier

#41
20200389130
2020-12-10

Multiple-stage power amplifiers implemented with multiple semiconductor technologies

#42
20200382084
2020-12-03

Amplifier with an at least second order filter in the control loop

#43
20200382072
2020-12-03

Amplifier circuit with high-order damping circuit and the high-order damping circuit

#44
20200373890
2020-11-26

Amplification circuit, radio-frequency front end circuit, and communication device

#45
20200366256
2020-11-19

Apparatus and methods for low noise amplifiers with mid-node impedance networks

#46
20200153397
2020-05-14

Class D amplifiers

#47
20200106409
2020-04-02

Chopper amplifier

#48
20200044617
2020-02-06

Apparatuses and methods for a chopper instrumentation amplifier

#49
20190356287
2019-11-21

Class D amplifiers

#50
20190334504
2019-10-31

High order miller N-path filter

#51
20190158034
2019-05-23

Chopper amplifiers with high pass filter for suppressing chopping ripple

#52
20190140598
2019-05-09

Multiple-stage power amplifiers implemented with multiple semiconductor technologies

#53
20190097591
2019-03-28

Apparatus and methods for low noise amplifiers with mid-node impedance networks

#54
20180329443
2018-11-15

Current mirror device and related amplifier circuit

#55
20180227008
2018-08-09

Power amplification module, front-end circuit, and communication device

#56
20180212572
2018-07-26

Class AB amplifier having cascode stage with filter for improving linearity

#57
20180190601
2018-07-05

High-frequency module

#58
20180175801
2018-06-21

Inter-stage network for radio frequency amplifier

#59
20180054171
2018-02-22

Apparatus and methods for low noise amplifiers with mid-node impedance networks

#60
20180048271
2018-02-15

Multi-stage bandpass low-noise amplifier

#61
20170230019
2017-08-10

High dynamic range sensing front-end for neural signal recording systems

#62
20170222608
2017-08-03

Adaptive bias circuit for a radio frequency (RF) amplifier

#63
20170054423
2017-02-23

Amplifier Device

#64
20170010360
2017-01-12

Detection of excessively high interference signal levels during reception of global navigation satellite system signals

#65
20160373148
2016-12-22

SATELLITE RECEIVER AND SIGNAL RECEIVING CIRCUIT THEREOF

#66
20160359459
2016-12-08

Circuits for low noise amplifiers with interferer reflecting loops

#67
20160322939
2016-11-03

Low noise amplifier having transformer feedback and method of using the same

#68
20160285426
2016-09-29

Power amplifiers with tunable notches

#69
20160211871
2016-07-21

High frequency power amplifier, high frequency front-end circuit, and radio communication device

#70
20150357979
2015-12-10

Operational amplifier

#71
20150349722
2015-12-03

Dual stage carrier-aggregation (CA) low noise amplifier (LNA) having harmonic rejection and high linearity

#72
20150288334
2015-10-08

Power amplifier

#73
20150180419
2015-06-25

High-frequency amplifier

#74
20150084699
2015-03-26

RF filter structure for antenna diversity and beam forming

#75
20150084688
2015-03-26

Baseband processing circuitry

#76
20140180052
2014-06-26

Neural recording system

#77
20140146926
2014-05-29

Receiver with adaptive filter and gain control

#78
20130315344
2013-11-28

RF transmitter and method of operation

#79
20130241653
2013-09-19

Instrumentation input systems

#80
20130149976
2013-06-13

Method and system for a linearized transmitter including a power amplifier

#81
20130099866
2013-04-25

System and method for a multi-band power-amplifier

#82
20130021095
2013-01-24

Power-amplifier arrangement

#83
20120274403
2012-11-01

Amplifier with integrated filter

#84
20120242410
2012-09-27

Bipolar stacked transistor architecture

#85
20120178391
2012-07-12

Adjustable circuit architecture

#86
20120139633
2012-06-07

SEMICONDUCTOR INTEGRATED CIRCUIT AND TUNER SYSTEM INCLUDING THE SAME

#87
20120133442
2012-05-31

Radiofrequency amplifier

#88
20120086513
2012-04-12

Instrumentation input systems

#89
20120019324
2012-01-26

Amplifier With Improved Input Resistance and Controlled Common Mode

#90
20110210787
2011-09-01

Switchless band separation for transceivers

#91
20110207420
2011-08-25

Narrow band RF filter circuits, devices and processes using impedance translation

#92
20110163808
2011-07-07

Amplifier with improved input resistance and controlled common mode

#93
20110143791
2011-06-16

Linearized transmitter including a power amplifier

#94
20110025412
2011-02-03

Amplifier

#95
20110007841
2011-01-13

RF TRANSMITTER AND METHOD OF OPERATION

#96
20100315915
2010-12-16

Input signal processing system

#97
20100277215
2010-11-04

Wideband voltage translators

#98
20100231304
2010-09-16

Semiconductor device

#99
20100176882
2010-07-15

Transconductance amplifier with a filter for rejecting noise outside the useful band

#100
20100172441
2010-07-08

Frequency translation module frequency limiting amplifier

#101
20100148873
2010-06-17

Techniques for improving amplifier linearity

#102
20100109776
2010-05-06

Millimeter wave monolithic integrated circuits

#103
20100007419
2010-01-14

Instrumentation input systems

#104
20090309653
2009-12-17

Chopper stabilized amplifier

#105
20090289722
2009-11-26

Bonded wafer package module

#106
20090189697
2009-07-30

Auto-tuning amplifier

#107
20090174474
2009-07-09

Power amplifier

#108
20090161329
2009-06-25

Semiconductor device

#109
20090108944
2009-04-30

Low-noise amplifier circuit including band-stop filter

#110
20090058492
2009-03-05

ELECTRONIC ISOLATOR

#111
20090036068
2009-02-05

WIRELESS SYSTEM HAVING HIGH SPECTRAL PURITY

#112
20090009244
2009-01-08

High-frequency circuit

#113
20080290938
2008-11-27

Multibit digital amplifier for radio-frequency transmission

#114
20080204148
2008-08-28

Amplifier with integrated filter

#115
20080139132
2008-06-12

Method and system for a linearized transmitter including a power amplifier

#116
20080136463
2008-06-12

Method and system for an LC resonant current gain boosting amplifier

#117
20080048777
2008-02-28

Semiconductor device

#118
20080048736
2008-02-28

Differential circuit and output buffer circuit including the same

#119
20080001585
2008-01-03

Low noise, low dropout regulators

#120
20070216481
2007-09-20

Low noise amplifiers for low-power impulse radio ultra-wideband receivers

#121
20070182481
2007-08-09

Distributed amplifier with built-in filtering functions

#122
20070146077
2007-06-28

Radio frequency power amplifier

#123
20070096830
2007-05-03

Wideband circuits and methods

#124
20070090877
2007-04-26

Wideband circuits and methods

#125
20070021088
2007-01-25

Dual-band active filter

#126
20070001300
2007-01-04

Semiconductor device

#127
20060215293
2006-09-28

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

#128
20060132242
2006-06-22

Low noise amplifier for wideband tunable matching

#129
20060132177
2006-06-22

Linear buffer

#130
20050269590
2005-12-08

Semiconductor device

#131
20050237116
2005-10-27

FET band amplifier

#132
20050237115
2005-10-27

FET band amplifier

#133
20050189980
2005-09-01

Electronic isolator

#134
20050077944
2005-04-14

Linear buffer

#135
16052586
2019-10-01

Apparatuses and methods for a chopper instrumentation amplifier

#136
15826536
2018-06-19

Wireless radio frequency transceiver system for internet of things

#137
15260790
2018-03-06

Power-efficient programmable broadband high-pass preamplifier systems