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Class Information
Number: 330/86
Name: Amplifiers > Signal feedback > Variable impedance in feedback path varied by separate control path
Description: Subject matter wherein the "signal feedback circuit means" has a variable impedance therein, which is varied by means of a control which may be a variable control voltage or a motor control means, the control to vary the variable impedance being derived, developed and applied by a path separate from that involving the variable impedance and the immediately associated signal transmission path.










Patents under this class:
1 2 3 4 5 6 7

Patent Number Title Of Patent Date Issued
8680920 Area efficient, programmable-gain amplifier Mar. 25, 2014
8643434 Adjustable gain audio power amplifying circuit Feb. 4, 2014
8570139 Variable resister having resistance varying geometrically ratio and control method thereof Oct. 29, 2013
8558612 Electronic device and method for an amplifier with resistive feedback Oct. 15, 2013
8519786 Variable gain amplifier with fixed bandwidth Aug. 27, 2013
8514017 Variable gain amplifier and audio device Aug. 20, 2013
8497462 Trans-impedance amplifier with variable bandwidth and digital coherent optical receiver installing the same Jul. 30, 2013
8497791 Operational amplifier Jul. 30, 2013
8476974 Differential amplifier and method for the operation of a differential amplifier Jul. 2, 2013
8461922 Offset component cancelation method and circuit Jun. 11, 2013
8410846 Variable gain amplifier Apr. 2, 2013
8405455 Amplifier and method for linearizing same Mar. 26, 2013
8390496 System and method for common mode translation Mar. 5, 2013
8299850 Device with reconfigurable continuous and discrete time functionality Oct. 30, 2012
8228121 Automatic gain control circuit Jul. 24, 2012
8207492 Chemical detection system and method using a capacitive trans impedance amplifier Jun. 26, 2012
8183916 Non-inverting amplifier and voltage supply circuit including the same May. 22, 2012
8179200 Amplifier circuit and light receiving amplifier circuit using the same May. 15, 2012
8131232 Method and apparatus for antenna tuning Mar. 6, 2012
8115545 Automatic level control Feb. 14, 2012
8111097 Device with reconfigurable continuous and discrete time functionality Feb. 7, 2012
8093944 Line driver capable of automatic adjustment of output impedance Jan. 10, 2012
8044718 Integrated programmable gain amplifier circuit and system including the circuit Oct. 25, 2011
8022758 Impedance matching circuit and method thereof Sep. 20, 2011
8013672 Programmable gain amplifier and embedded filter Sep. 6, 2011
8004354 Automatic level control Aug. 23, 2011
7999780 Drive circuit containing amplifier circuit Aug. 16, 2011
7973598 Audio power amplifier and a pre-amplifier thereof Jul. 5, 2011
7952430 Amplifier circuit, integrated circuit and radio frequency communication unit May. 31, 2011
7944292 Method and apparatus to remove the DC component of a feedback signal May. 17, 2011
7917114 DC cancellation circuit Mar. 29, 2011
7907008 Dynamic signal contamination suppression Mar. 15, 2011
7902920 Amplifier circuit, integrated circuit and radio frequency communication unit Mar. 8, 2011
7876151 R/2R programmable gate array Jan. 25, 2011
7869770 Apparatus, methods and articles of manufacture for a multi-band switch Jan. 11, 2011
7868694 Variable resistor array and amplifier circuit Jan. 11, 2011
7843261 Resistor network for programmable transconductance stage Nov. 30, 2010
7843266 Amplifier for improving electrostatic discharge characteristic Nov. 30, 2010
7800441 Feedback amplifier and audio system thererof Sep. 21, 2010
7777565 Differential amplification circuit and manufacturing method thereof Aug. 17, 2010
7755424 Operational amplifier with resistance switch crossbar feedback Jul. 13, 2010
7746260 Multiplying digital-to-analog converter for high speed and low supply voltage Jun. 29, 2010
7737775 Low-noise DC offset calibration circuit and related receiver stage Jun. 15, 2010
7719362 Programmable-gain amplifier systems to facilitate low-noise, low-distortion volume control May. 18, 2010
7702119 Multi-input gain control circuit Apr. 20, 2010
7701285 Power amplifiers having improved startup linearization and related operating methods Apr. 20, 2010
7701284 Line driver capable of automatically adjusting output impedance Apr. 20, 2010
7696819 Switched-capacitor variable gain amplifier having high voltage gain linearity Apr. 13, 2010
7692486 Configurable feedback for an amplifier Apr. 6, 2010
7652537 Amplifier with programmable input impedance Jan. 26, 2010

1 2 3 4 5 6 7










 
 
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