H03H11/1217 - CPC Classification Index

ClassID:

220856 ⎘

H03H11/1217 - CPC Classification

Classification description:

Networks using active elements; Multiple-port networks; Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers

Sub-classes:

H03H11/1221 » {Theory; Synthesis } 5
H03H11/1226 » {Filters using operational amplifier poles} 4
H03H11/123 » {Modifications to reduce sensitivity} 2
H03H11/1234 » {Modifications to reduce detrimental influences of amplifier imperfections, e.g. limited gain-bandwith product, limited input impedance} 4
H03H11/1239 » {Modifications to reduce influence of variations of temperature} 7
H03H11/1243 » {Simulation of ladder networks} 3
H03H11/1252 » {Two integrator-loop-filters} 59

Recent Application in this class:

20260058622

2026-02-26

Ripple Reduction Using Chopper Amplifiers

20250080086

2025-03-06

ACTIVE FILTER DEVICE AND ELECTRIC COMPRESSOR COMPRISING SAME

20250023461

2025-01-16

ACTIVE ELECTROMAGNETIC INTERFERENCE FILTER WITH DAMPING NETWORK

20240195392

2024-06-13

BASELINE RESTORER CIRCUIT

20240154604

2024-05-09

ACTIVE RC-TYPE FILTER AND METHOD OF IMPLEMENTING AN ACTIVE RC-TYPE FILTER

20230412151

2023-12-21

Hybrid filter circuit and system with hybrid filter circuit

20230179090

2023-06-08

Active electromagnetic interference filter with damping network

20220329218

2022-10-13

AUDIO AMPLIFYING CIRCUIT AND PLAYING DEVICE

20220131529

2022-04-28

Electronic device and a method for suppressing noise for an electronic device

#10

20200321942

2020-10-08

Tunable filter for RF circuits

#11

20200313549

2020-10-01

Active electromagnetic interference filter with damping network

#12

20200274522

2020-08-27

Harmonic rejection filter with transimpedence amplifiers

#13

20190245522

2019-08-08

Method and device for adjusting passband width of filter

#14

20190199327

2019-06-27

Filter networks for driving capacitive loads

#15

20190013796

2019-01-10

Tunable filter for RF circuits

#16

20170149412

2017-05-25

Adjustable low-pass filter in a compact low-power receiver

#17

20170082672

2017-03-23

Electrical system with arc fault detection

#18

20170077903

2017-03-16

Complex band pass filter and receiver

#19

20170063340

2017-03-02

Programmable band-pass filter circuit of analog front-end used for capacitance detection

#20

20160149559

2016-05-26

Low-pass filter

#21

20150318836

2015-11-05

Second-order filter with notch for use in receivers to effectively suppress the transmitter blockers

#22

20150303880

2015-10-22

Low pass filter with common-mode noise reduction

#23

20150200648

2015-07-16

Operational transconductance amplifier, operational transconductance amplifier-capacitor filter and high order reconfigurable analog filter

#24

20150028944

2015-01-29

Optimal low power complex filter

#25

20140333372

2014-11-13

Universal filter implementing second-order transfer function

#26

20140292401

2014-10-02

Voltage fed feed forward active EMI filter

#27

20140218113

2014-08-07

Dynamic feed-forward OPAMP-based circuit

#28

20140184319

2014-07-03

Shaper design in CMOS for high dynamic range

#29

20140035667

2014-02-06

Differential source follower having 6dB gain with applications to WiGig baseband filters

#30

20130225101

2013-08-29

Second-order filter with notch for use in receivers to effectively suppress the transmitter blockers

#31

20130194034

2013-08-01

Universal filter implementing second-order transfer function

#32

20130076434

2013-03-28

Differential source follower having 6dB gain with applications to WiGig baseband filters

#33

20120021712

2012-01-26

Compact low-power receiver including transimpedance amplifier, digitally controlled interface circuit, and low pass filter

#34

20100289479

2010-11-18

Sensor system and method

#35

20090108924

2009-04-30

Structure for managing voltage swings across field effect transistors

#36

20080069268

2008-03-20

Rc Filter Pole for Fm Transmitters

#37

20070236282

2007-10-11

System and method for dynamic power-optimization of analog active filters

#38

20070111693

2007-05-17

Balanced band-pass filter for radio receivers

#39

20060267677

2006-11-30

Method and system for passband ripple cancellation in cascading filters

#40

20060197587

2006-09-07

Active filter

#41

20060183456

2006-08-17

Semiconductor device, radio terminal device, and radio communication equipment

#42

20060038611

2006-02-23

Differential filter topology with dielectric absorption cancellation for a data acquisition device

#43

20050162219

2005-07-28

Active filter

#44

20050149592

2005-07-07

Complex filter with higher order pole

#45

20050128115

2005-06-16

Loop filter for a continuous time sigma delta analog to digital converter

#46

20050052226

2005-03-10

Forward-amplifying filter circuit

#47

20050052225

2005-03-10

Calibrated fully differential RC filter

#48

15342133

2018-04-10

Filter circuit for noise cancellation earphones

#49

15238176

2017-06-06

Center frequency and Q tuning of biquad filter by amplitude-limited oscillation-based calibration

#50

15236091

2017-10-24

Active bandpass filter circuit with adjustable resistance device and adjustable capacitance device

#51

14951467

2017-01-17

Floating immittance emulator

#52

14588311

2018-09-04

Tunable filter for RF circuits