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Class Information
Number: 330/281
Name: Amplifiers > With semiconductor amplifying device (e.g., transistor) > Including gain control means > And significant control voltage developing means > With time constant means
Description: Subject matter including a circuit for filtering the control voltage, and wherein specific details or distinctive characteristics of such circuit are claimed.

Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8519877 Low noise and low power arrangement for playing audio signals Aug. 27, 2013
8238868 Dynamic voltage scaling for packet-based data communication systems Aug. 7, 2012
8179648 Power amplifier protection May. 15, 2012
8115552 Amplifier circuit with step gain Feb. 14, 2012
7783062 Automatic audio distortion control method and apparatus Aug. 24, 2010
7734267 Amplifier assembly, receiver comprising said assembly and method for operating a programmable amplifier Jun. 8, 2010
7671680 Electronic circuit Mar. 2, 2010
7663441 Low noise amplifier Feb. 16, 2010
7336130 Attenuator, variable gain amplifier using the same, and electronic equipment Feb. 26, 2008
7233200 AGC circuit, AGC circuit gain control method, and program for the AGC circuit gain control method Jun. 19, 2007
7221226 Amplifying apparatus with automatic level controller May. 22, 2007
7123089 Power amplifier with pulse differentiating circuit Oct. 17, 2006
7065336 Analog base band unit for a RF receiver and method for using the same Jun. 20, 2006
6927632 Low distortion compression amplifier Aug. 9, 2005
6844780 Automatic gain control circuit Jan. 18, 2005
6795694 Automatic gain control system Sep. 21, 2004
6784742 Voltage amplifying circuit Aug. 31, 2004
6624700 Radio frequency power amplifier for cellular telephones Sep. 23, 2003
6621345 Gain control device for packet signal receiver Sep. 16, 2003
6586994 Variable gain and low noise amplifier for received signals in imaging apparata Jul. 1, 2003
6573786 Electronic devices comprising an audio amplifier and methods for controlling such electronic devices Jun. 3, 2003
6476677 Power amplifier saturation detection and compensation Nov. 5, 2002
6472938 Automatic level controlling circuit Oct. 29, 2002
6426677 Linearization bias circuit for BJT amplifiers Jul. 30, 2002
6420928 AC coupled pre-amplifier for burst signal Jul. 16, 2002
6388526 Methods and apparatus for high performance reception of radio frequency communication signals May. 14, 2002
6384686 Radio communication apparatus and radio frequency power amplifier May. 7, 2002
6288612 Radio communication apparatus and radio frequency power amplifier Sep. 11, 2001
6265939 Linear power detectors and methods for power amplifiers Jul. 24, 2001
6242981 AGC circuit Jun. 5, 2001
6208209 Automatic gain control circuit using a capacitor for minimizing digital coupling Mar. 27, 2001
6028469 Electric circuit arrangement comprising a switchable feedback branch Feb. 22, 2000
6014180 Automatic gain control loop circuit Jan. 11, 2000
5955927 RF power transistor control using collector current Sep. 21, 1999
5847609 Automatic gain control circuit for selectively providing an accurate linearity or a broad bandwidth Dec. 8, 1998
5697074 Dual rate power control loop for a transmitter Dec. 9, 1997
5663689 Method and apparatus for providing a high speed charge pump with low static error Sep. 2, 1997
5523575 Image identifying apparatus using an image sensor to extract false image data from a document image and discriminate the image by comparing the false image data to a predetermined pattern Jun. 4, 1996
5422602 Frequency discriminate leveler Jun. 6, 1995
5352988 Automatic gain controller Oct. 4, 1994
5339046 Temperature compensated variable gain amplifier Aug. 16, 1994
5337201 Information signal output apparatus with amplitude control having selected speed response Aug. 9, 1994
5329243 Noise adaptive automatic gain control circuit Jul. 12, 1994
5304947 Arrangement for eliminating offset errors in a power control circuit of a pulsed transmitter final amplifier Apr. 19, 1994
5296821 Method and apparatus for controlling transient responses in a power amplifier Mar. 22, 1994
5281925 RF amplifier providing reduced drive response rise times and fall times Jan. 25, 1994
5227737 Method and apparatus for adjusting the pole positions of a differentiating amplifier Jul. 13, 1993
5165017 Automatic gain control circuit in a feed forward configuration Nov. 17, 1992
5138277 Signal processing system having a very long time constant Aug. 11, 1992
5130668 Amplifier arrangement with time constant control Jul. 14, 1992

1 2 3

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