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Class Information
Number: 330/280
Name: Amplifiers > With semiconductor amplifying device (e.g., transistor) > Including gain control means > And significant control voltage developing means > With delay means
Description: Subject matter including circuit means which impart to the control voltage, a minimum level at which the control voltage developing means begins to function.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8665017 Amplifier circuit and radio communication apparatus Mar. 4, 2014
8654867 Transformer power combiner with filter response Feb. 18, 2014
8629717 Power consumption control circuit, amplifier circuit and power consumption control method Jan. 14, 2014
7970362 RF transmitter with compensation of differential path delay Jun. 28, 2011
7761068 System and method for a time alignment analog notch Jul. 20, 2010
7606544 System for dynamic control of automatic gain control take-over-point and method of operation Oct. 20, 2009
7302021 Digital broadcast receiving apparatus Nov. 27, 2007
7292103 Amplifier system having compensated amplification variation Nov. 6, 2007
7199665 Single to dual non-overlapping converter Apr. 3, 2007
6977548 Predistortion circuit, low-distortion power amplifier, and control methods therefor Dec. 20, 2005
6960957 Predistortion circuit, low-distortion power amplifier, and control methods therefor Nov. 1, 2005
6859101 Frequency-selective phase/delay control for an amplifier Feb. 22, 2005
6831516 Method of forming a variable propagation delay semiconductor device and structure therefor Dec. 14, 2004
6763470 System and method for dynamically amplifying a delayed analog signal based on amplitude information obtained from its digital representation Jul. 13, 2004
6664850 Delay variability reduction method and apparatus Dec. 16, 2003
6603359 High-frequency power amplifying apparatus Aug. 5, 2003
6590449 Predistortion circuit, low-distortion power amplifier, and control methods therefor Jul. 8, 2003
6573786 Electronic devices comprising an audio amplifier and methods for controlling such electronic devices Jun. 3, 2003
6531921 Operational amplifier Mar. 11, 2003
6484017 Up converter of base station transmitter in wireless communication system and method of controlling outputs thereof Nov. 19, 2002
6380804 Method and apparatus for switching stages of a multistage amplifier quickly between operational modes Apr. 30, 2002
6133789 Method and system for robustly linearizing a radio frequency power amplifier using vector feedback Oct. 17, 2000
6121835 Variable time delay network, method and apparatus thereof Sep. 19, 2000
6107879 Automatic dynamic range control circuit Aug. 22, 2000
6047167 Output power control device Apr. 4, 2000
5805022 Circuit for automatically regulating the gain of a differential amplifier Sep. 8, 1998
5745016 Method for improving power measurement implemented with a directional coupler at low power levels Apr. 28, 1998
5699017 Automatic gain control circuit Dec. 16, 1997
5677962 Hybrid analog and digital amplifier with a delayed step change in the digital gain Oct. 14, 1997
5672999 Audio amplifier clipping avoidance method and apparatus Sep. 30, 1997
5606285 Power control circuit for use with transmitter Feb. 25, 1997
5548833 Data independent automatic gain control circuit for telecommunication applications Aug. 20, 1996
5515004 Method and apparatus for precision gain control for amplified signals May. 7, 1996
5515008 Output level automatic control apparatus May. 7, 1996
5483198 Method and apparatus for controlling amplifier power Jan. 9, 1996
5475342 Amplifier for stably maintaining a constant output Dec. 12, 1995
5412341 Power control apparatus and method for a radio frequency amplifier May. 2, 1995
5404115 Variable gain amplifier Apr. 4, 1995
5363057 Control device for power amplifier Nov. 8, 1994
5339046 Temperature compensated variable gain amplifier Aug. 16, 1994
5337020 Differential radio frequency detector/comparator for power level control Aug. 9, 1994
5337006 Output level control circuit for use in RF transmitter Aug. 9, 1994
5327101 Distortion-free limiter for a power amplifier Jul. 5, 1994
5304947 Arrangement for eliminating offset errors in a power control circuit of a pulsed transmitter final amplifier Apr. 19, 1994
5203016 Signal quality-dependent adaptive recursive integrator Apr. 13, 1993
5122760 Detector for automatic gain control amplifier circuit Jun. 16, 1992
5063311 Programmable time delay circuit for digital logic circuits Nov. 5, 1991
5051707 Gain control circuit for amplifier having stepwise variable gain Sep. 24, 1991
5045809 Automatic gain control (AGC) circuit for a trunk interface in a private branch exchange (PBX) Sep. 3, 1991
4987383 Integrated compression amplifier having programmable threshold voltage Jan. 22, 1991

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