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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 4485349 |
Stabilized microwave power amplifier system |
Nov. 27, 1984 |
| 4471324 |
All NPN variably controlled amplifier |
Sep. 11, 1984 |
| 4456886 |
Control circuit for voltage controlled variable attenuator |
Jun. 26, 1984 |
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