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Class Information
Number: 330/282
Name: Amplifiers > With semiconductor amplifying device (e.g., transistor) > Including gain control means > Having feedback means acting as variable impedance
Description: Subject matter including a feedback means acting as a variable impedance to control the gain of the amplifier.










Sub-classes under this class:

Class Number Class Name Patents
330/283 Having emitter degeneration 133


Patents under this class:
1 2 3 4 5 6 7 8

Patent Number Title Of Patent Date Issued
8576008 Radio frequency signal gain control Nov. 5, 2013
8538355 Quadrature power amplifier architecture Sep. 17, 2013
8519877 Low noise and low power arrangement for playing audio signals Aug. 27, 2013
8519786 Variable gain amplifier with fixed bandwidth Aug. 27, 2013
8503953 Quadrature power amplifier architecture Aug. 6, 2013
8456237 Low noise variable gain amplifier utilizing variable feedback techniques with constant input/output impedance Jun. 4, 2013
8456337 System to interface analog-to-digital converters to inputs with arbitrary common-modes Jun. 4, 2013
8421538 Feedback amplifier Apr. 16, 2013
8395447 Low-noise amplifier Mar. 12, 2013
8385846 Active load isolator and wireless speaker for mixed signal environments Feb. 26, 2013
8374363 Amplifier circuit of capacitor microphone Feb. 12, 2013
8344805 High-frequency differential amplifier circuit Jan. 1, 2013
8324969 Delta-sigma modulator approach to increased amplifier gain resolution Dec. 4, 2012
8315581 Transmitter with hybrid closed loop power control Nov. 20, 2012
RE43776 Layout technique for matched resistors on an integrated circuit substrate Oct. 30, 2012
8232841 Amplifier with output filtering Jul. 31, 2012
8229382 Switched current resistor programmable gain array for low-voltage wireless LAN and method using the same Jul. 24, 2012
8219058 Radio receiver Jul. 10, 2012
8207492 Chemical detection system and method using a capacitive trans impedance amplifier Jun. 26, 2012
8183923 Constant gain amplifier system with gain control feedback May. 22, 2012
8149057 Signal processing circuit Apr. 3, 2012
8121556 Active load isolator and wireless speaker for mixed signal environments Feb. 21, 2012
8107901 Feedback loop with adjustable bandwidth Jan. 31, 2012
8098181 Attenuator circuit Jan. 17, 2012
8049566 Feedback LNA with resistor Nov. 1, 2011
8013768 Integrated upstream amplifier for cable modems and cable set-top boxes Sep. 6, 2011
7999780 Drive circuit containing amplifier circuit Aug. 16, 2011
7961896 Expander circuit with reduced distortion Jun. 14, 2011
7956680 Low-noise DC offset calibration circuit and related receiver stage Jun. 7, 2011
7949322 Frequency selective amplifier with wide-band impedance and noise matching May. 24, 2011
7944292 Method and apparatus to remove the DC component of a feedback signal May. 17, 2011
7940122 Amplifier circuit and communication device May. 10, 2011
7915955 Bias balancing circuit Mar. 29, 2011
7898334 Amplifier with output filtering Mar. 1, 2011
7876520 Programmable high pass amplifier for perpendicular recording systems Jan. 25, 2011
7868694 Variable resistor array and amplifier circuit Jan. 11, 2011
7843266 Amplifier for improving electrostatic discharge characteristic Nov. 30, 2010
7816991 Signal splitter Oct. 19, 2010
7795978 Programmable gain circuit and amplification circuit Sep. 14, 2010
7719362 Programmable-gain amplifier systems to facilitate low-noise, low-distortion volume control May. 18, 2010
7701285 Power amplifiers having improved startup linearization and related operating methods Apr. 20, 2010
7701292 Programmable gain amplifier with noise cancellation Apr. 20, 2010
7702119 Multi-input gain control circuit Apr. 20, 2010
7679446 Variable-gain low-noise amplifier Mar. 16, 2010
7652528 Analog switch controller Jan. 26, 2010
7652537 Amplifier with programmable input impedance Jan. 26, 2010
7605659 Gain adjustment for programmable gain amplifiers Oct. 20, 2009
7602239 Variable gain amplifier circuits Oct. 13, 2009
7595693 System and method for providing a configurable inductor less multi-stage low-noise amplifier Sep. 29, 2009
7573126 Matching circuits on optoelectronic devices Aug. 11, 2009

1 2 3 4 5 6 7 8










 
 
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