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Class Information
Number: 330/145
Name: Amplifiers > Variable impedance for signal channel controlled by separate control path > Electron tube or diode as impedance
Description: Subject matter wherein the variable impedance means is an electron tube, either vacuum tube or gaseous which has a control means effective during operation of the tube, or a diode.










Patents under this class:
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Patent Number Title Of Patent Date Issued
8155348 Post phase-inverter volume control Apr. 10, 2012
7609116 Integrated amplifier arrangement Oct. 27, 2009
7567122 Variable gain amplifiers systems and methods Jul. 28, 2009
7397303 Vacuum tube circuit Jul. 8, 2008
7253682 Antenna amplifier Aug. 7, 2007
6801757 Circuit configuration for matching an amplifier to a radio-frequency line, and use of the circuit configuration Oct. 5, 2004
6724253 Predistortion type linearizer controlled by two control voltages Apr. 20, 2004
6639469 Variable-gain amplifier circuit Oct. 28, 2003
6400222 Linearizer Jun. 4, 2002
6356150 Portable integrated switching power amplifier Mar. 12, 2002
6255908 Temperature compensated and digitally controlled amplitude and phase channel amplifier linearizer for multi-carrier amplification systems Jul. 3, 2001
6215359 Impedance matching for a dual band power amplifier Apr. 10, 2001
6075414 High frequency amplifier having a variable attenuator connected to the base of an amplifier FET Jun. 13, 2000
6064256 High frequency multi-stage capacitively coupled amplifier circuits May. 16, 2000
6020787 Method and apparatus for amplifying a signal Feb. 1, 2000
5966051 Low voltage medium power class C power amplifier with precise gain control Oct. 12, 1999
5742206 Gain control circuit and variable gain power amplifier using same Apr. 21, 1998
5673001 Method and apparatus for amplifying a signal Sep. 30, 1997
5668499 Tube type power amplifier with distortion control Sep. 16, 1997
5486791 Programmable gain amplifier Jan. 23, 1996
5432478 Linear interpolation circuit Jul. 11, 1995
5430411 High-frequency amplifier arrangement, transceiver station comprising such an amplifier arrangement and mobile radio system comprising such stations Jul. 4, 1995
5423074 AM-FM transmitter power amplifier Jun. 6, 1995
5365190 Feed-forward digital phase and amplitude correction system Nov. 15, 1994
5361403 AM-FM transmitter power amplifier Nov. 1, 1994
5327101 Distortion-free limiter for a power amplifier Jul. 5, 1994
5304948 RF amplifier with linear gain control Apr. 19, 1994
5243300 High frequency amplifying apparatus Sep. 7, 1993
5201009 Signal processor Apr. 6, 1993
5128629 Method for controlling the output power of digital cellular telephones Jul. 7, 1992
5066924 Pulse power amplifier Nov. 19, 1991
5012199 Multi-stage musical instrument amplifier having distortion modes Apr. 30, 1991
4992753 Power amplifier for a radio frequency signal Feb. 12, 1991
4950040 Measuring range selection switch Aug. 21, 1990
4868519 Microprocessor-controlled amplifier Sep. 19, 1989
4864245 Modification unit for an amplifier Sep. 5, 1989
4851842 Analog-to-digital conversion circuit Jul. 25, 1989
4839611 Voltage controlled high-frequency attenuator Jun. 13, 1989
4803440 Automatic electrical power control circuit Feb. 7, 1989
4786879 Attenuator circuit employing bootstrapping Nov. 22, 1988
4766395 Circuits to provide desired conductance characteristics using a FET Aug. 23, 1988
4689498 Signal input circuit with constant operating power Aug. 25, 1987
4673886 Adaptively stabilized RF amplifier Jun. 16, 1987
4646036 Signal attenuation circuit Feb. 24, 1987
4644289 Variable power amplifier for audio frequency signals and method Feb. 17, 1987
4591799 High power klystron amplifier for supplying a variable load May. 27, 1986
4581589 Apparatus for avoiding clipping of amplifier Apr. 8, 1986
4553105 Multistage linear amplifier for a wide range of input signal levels Nov. 12, 1985
4509022 Amplifier circuit with automatic gain control and hearing aid equipped with such a circuit Apr. 2, 1985
4494076 Signal input circuit with controlled input signal attenuation Jan. 15, 1985

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