ClassID:

219185

H03F1/347 - CPC Classification

Classification description:

Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements; Negative-feedback-circuit arrangements with or without positive feedback using transformers

Recent Application in this class:
#1
20250336592
2025-10-30

BALUN DESIGN FOR ULTRA HIGH BAND

#2
20250274081
2025-08-28

DIFFERENTIAL AMPLIFIER INCLUDING DUAL MAGNETICALLY COUPLED FEEDBACK LOOPS

#3
20250159788
2025-05-15

FRONT END SYSTEMS WITH SELECTIVELY SHIELDED RADIO FREQUENCY MODULE

#4
20250159787
2025-05-15

PACKAGED MODULE WITH FRONT END INTEGRATED CIRCUIT AND STACKED FILTER ASSEMBLY

#5
20250159786
2025-05-15

PACKAGED MODULE WITH FRONT END INTEGRATED CIRCUIT, CRYSTAL, AND SYSTEM-ON-A-CHIP

#6
20240098864
2024-03-21

Packaged module with antenna and front end integrated circuit

#7
20220103134
2022-03-31

Differential amplifier including dual magnetically coupled feedback loops

#8
20220103133
2022-03-31

Amplifier including magnetically coupled feedback loop and stacked input and output stages adapted for DC current reuse

#9
20220103132
2022-03-31

Amplifier linearization using magnetically coupled feedback

#10
20220103131
2022-03-31

Amplifier linearization using magnetically coupled feedback provided by a transformer coupled to a balun-based load

#11
20220102070
2022-03-31

Method of improving linearity of amplifier circuit including magnetically coupled feedback loop and DC bias current adjustment without impacting amplifier gain

#12
20210217714
2021-07-15

Selectively shielded radio frequency module with multi-mode stacked power amplifier stage

#13
20210217713
2021-07-15

Front end systems with multi-mode power amplifier stage and overload protection of low noise amplifier

#14
20210211103
2021-07-08

Impedance transformation circuit for amplifier

#15
20210143777
2021-05-13

Structure and method of audio amplifier with power feedback

#16
20200357756
2020-11-12

Selectively shielded radio frequency module with linearized low noise amplifier

#17
20200266775
2020-08-20

Amplifier for reusing current by using transformer and method thereof

#18
20190296703
2019-09-26

Differential power amplifier

#19
20190238097
2019-08-01

Negative feedback gain transimpedance amplifier (TIA) systems

#20
20190229679
2019-07-25

High-gain low noise figure low noise complementary metal oxide semiconductor amplifier with low current consumption

#21
20190214354
2019-07-11

Front end systems with linearized low noise amplifier and injection-locked oscillator power amplifier stage

#22
20190198465
2019-06-27

Compensation device for transistors

#23
20190190454
2019-06-20

Amplifier circuit

#24
20190181815
2019-06-13

IMPEDANCE TRANSFORMATION CIRCUIT AND OVERLOAD PROTECTION FOR LOW NOISE AMPLIFIER

#25
20190181809
2019-06-13

Impedance transformation circuit for amplifier

#26
20180278222
2018-09-27

Power amplification circuit

#27
20180226367
2018-08-09

Front end systems and related devices, integrated circuits, modules, and methods

#28
20180138872
2018-05-17

Impedance transformation circuit for amplifier

#29
20180102749
2018-04-12

Ultra-broadband transimpedance amplifiers (tia) for optical fiber communications

#30
20180026592
2018-01-25

Impedance transformation circuit and overload protection for low noise amplifier

#31
20170346449
2017-11-30

Low noise amplifier

#32
20170317648
2017-11-02

High-gain low noise figure complementary metal oxide semiconductor amplifier with low current consumption

#33
20170237402
2017-08-17

RF amplifier to increase gain using transformer

#34
20170117858
2017-04-27

Push-pull amplifier, corresponding apparatus and method

#35
20160336983
2016-11-17

Radio frequency low noise amplifier with on-chip matching and built-in tunable filter

#36
20160336915
2016-11-17

Active notch filter

#37
20160322939
2016-11-03

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

#38
20160126896
2016-05-05

Transformer feedback amplifier

#39
20160079930
2016-03-17

Low noise amplifier

#40
20150229285
2015-08-13

Bandwidth improvement for amplifiers

#41
20140266470
2014-09-18

Transformer-based power amplifier stabilization and reference distortion reduction

#42
20140015614
2014-01-16

System and Method for a Low Noise Amplifier

#43
20130281043
2013-10-24

Low noise amplifier

#44
20130207732
2013-08-15

Amplifier with reduced source degeneration inductance

#45
20130009704
2013-01-10

Transceiver and integrated circuit

#46
20120293268
2012-11-22

Narrowband amplifier with improved interference suppression

#47
20120218041
2012-08-30

Amplifier circuit

#48
20110279184
2011-11-17

Area efficient concurrent matching transceiver

#49
20110148527
2011-06-23

Dual-loop feedback amplifying circuit

#50
20100052784
2010-03-04

Low noise amplifier

#51
20090195312
2009-08-06

Differential amplifier

#52
20090108937
2009-04-30

Low noise amplifier and differential amplifier

#53
20070290745
2007-12-20

Low-noise amplifiers

#54
20070285162
2007-12-13

Highly linear low-noise amplifiers

#55
20070279131
2007-12-06

Variable gain amplifier and differential amplifier

#56
20070152902
2007-07-05

Directive, broadband, high gain, active antenna system

#57
20070046376
2007-03-01

Neutralization of feedback capacitance in amplifiers

#58
20050001680
2005-01-06

Low-noise preamplifier, in particular, for nuclear magnetic resonance (NMR)