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Class Information
Number: 330/283
Name: Amplifiers > With semiconductor amplifying device (e.g., transistor) > Including gain control means > Having feedback means acting as variable impedance > Having emitter degeneration
Description: Subject matter including a feedback means acting as a variable impedance in the common electrode of the amplifier to control the gain of the amplifier.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8665059 High frequency resistor Mar. 4, 2014
8629720 Driving method for obtaining a gain linear variation of a transconductance amplifier and corresponding driving circuit Jan. 14, 2014
8576008 Radio frequency signal gain control Nov. 5, 2013
8514021 Radio frequency integrated circuit Aug. 20, 2013
8432217 Amplifier Apr. 30, 2013
8378748 Amplifier Feb. 19, 2013
8324969 Delta-sigma modulator approach to increased amplifier gain resolution Dec. 4, 2012
8319555 Amplifier Nov. 27, 2012
8294515 Amplifier Oct. 23, 2012
8264282 Amplifier Sep. 11, 2012
8258871 Amplifier Sep. 4, 2012
8203388 Low noise amplifier Jun. 19, 2012
8154343 High dynamic range low-power differential input stage Apr. 10, 2012
8102213 Multi-mode low noise amplifier with transformer source degeneration Jan. 24, 2012
8031005 Amplifier supporting multiple gain modes Oct. 4, 2011
8008973 Amplifier for amplifying a high-frequency signal Aug. 30, 2011
7978011 Systems and methods for mitigating distortion in single-ended amplifiers Jul. 12, 2011
7969246 Systems and methods for positive and negative feedback of cascode transistors for a power amplifier Jun. 28, 2011
7948319 Current-mirroring systems and methods May. 24, 2011
7948323 Linear transimpedance amplifier with wide dynamic range for high rate applications May. 24, 2011
7944298 Low noise and low input capacitance differential MDS LNA May. 17, 2011
7944287 Low-noise, wide offset range, programmable input offset amplifier front end and method May. 17, 2011
7902925 Amplifier with active post-distortion linearization Mar. 8, 2011
7847636 Low noise amplifier for ultra wide band Dec. 7, 2010
7737785 Amplifier circuit with adjustable amplification Jun. 15, 2010
7705682 Inductor sharing in radio frequency communications Apr. 27, 2010
7701288 Variable gain amplifiers Apr. 20, 2010
7696828 Multi-linearity mode LNA having a deboost current path Apr. 13, 2010
7667539 Low-voltage wide-range linear transconductor cell Feb. 23, 2010
7626457 AGC module and method for controlling noise figure and intermodulation characteristics therein Dec. 1, 2009
7616059 Temperature compensation of small signal gain of an amplifier stage Nov. 10, 2009
7616061 Low noise amplifier for ultra wide band Nov. 10, 2009
7592869 Variable gain amplifier having dual gain control Sep. 22, 2009
7583166 Inductor Q factor enhancement apparatus has bias circuit that is coupled to negative resistance generator for providing bias signal Sep. 1, 2009
7532070 Analog variable gain amplifier with improved dynamic range characteristics May. 12, 2009
7495514 Low noise amplifier Feb. 24, 2009
7489192 Low-noise amplifiers Feb. 10, 2009
7486135 Configurable, variable gain LNA for multi-band RF receiver Feb. 3, 2009
7474715 Variable load circuit for reducing quadrature phase error Jan. 6, 2009
7432765 Variable gain amplifier, mixer and quadrature modulator using the same Oct. 7, 2008
7433656 Reducing flicker noise in two-stage amplifiers Oct. 7, 2008
7423487 Variable gain feedback amplifier circuit apparatus and method therefor Sep. 9, 2008
7378908 Variable gain differential amplifier, and variable degeneration impedance control device and method for use in the same May. 27, 2008
7319364 Amplifier circuit having improved linearity and frequency band using multiple gated transistor Jan. 15, 2008
7298213 Input impedance matching circuit for low noise amplifier Nov. 20, 2007
7292104 Variable gain amplifier Nov. 6, 2007
7233205 Transistor biasing independent of inductor voltage drop Jun. 19, 2007
7230490 Voltage to current converter and method for converting Jun. 12, 2007
7221227 Methods and apparatus for reducing output current oscillations of a driver provided with circuitry that senses and responds to excessive current draws of an output stage of the driver May. 22, 2007
7202743 High frequency amplifier Apr. 10, 2007

1 2 3

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