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Class Information
Number: 330/149
Name: Amplifiers > Hum or noise or distortion bucking introduced into signal channel
Description: Subject matter wherein the signal has a hum or noise component inadvertently introduced therein, as where there is ineffective filtering of a rectified A.C. power supply or bias, and wherein such objectional component is removed or reduced by the same hum or noise component introduced into the signal path of the amplifier in such manner as to oppose the objectional signal component, thereby removing it from, or reducing it in, the output signal.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5543752 |
Microwave amplifier circuit having reduced harmonic distortion |
Aug. 6, 1996 |
| 5534820 |
Compensating for non-linear effects in signal processing with active devices |
Jul. 9, 1996 |
| 5535247 |
Frequency modifier for a transmitter |
Jul. 9, 1996 |
| 5523716 |
Microwave predistortion linearizer |
Jun. 4, 1996 |
| 5524285 |
Radio transmitter with power amplifier and linearization |
Jun. 4, 1996 |
| 5524286 |
Baseband predistortion system for the adaptive linearization of power amplifiers |
Jun. 4, 1996 |
| 5521550 |
Digital circuitry for noise blanking |
May. 28, 1996 |
| 5512856 |
Method and apparatus for nonlinear compensation |
Apr. 30, 1996 |
| 5508657 |
Feed forward cancellation amplifier utilizing dynamic vector control |
Apr. 16, 1996 |
| 5509078 |
Circuit for preventing crosstalk |
Apr. 16, 1996 |
| 5491454 |
Method and apparatus for reducing distortion in an output signal of an amplifier |
Feb. 13, 1996 |
| 5489875 |
Adaptive feedforward linearizer for RF power amplifiers |
Feb. 6, 1996 |
| 5488258 |
Circuit for muting noises in a power amplifier |
Jan. 30, 1996 |
| 5486789 |
Apparatus and method for providing a baseband digital error signal in an adaptive predistorter |
Jan. 23, 1996 |
| 5485120 |
Feed-forward power amplifier system with adaptive control and control method |
Jan. 16, 1996 |
| 5483681 |
Apparatus for compensating of phase rotation in a final amplifier stage |
Jan. 9, 1996 |
| 5471164 |
Microwave amplifier linearizer |
Nov. 28, 1995 |
| 5467056 |
Very high speed precision amplifier |
Nov. 14, 1995 |
| 5455538 |
Linear amplifier for amplifying a composite signal of plural frequency components |
Oct. 3, 1995 |
| 5448203 |
Negative-feedback amplifier and feedback controlling method thereof |
Sep. 5, 1995 |
| 5442316 |
Temperature compensated and supply independent clipping distortion indicator |
Aug. 15, 1995 |
| 5434538 |
Gain enhancement for amplifier using a replica amplifier |
Jul. 18, 1995 |
| 5430409 |
Amplifier clipping distortion indicator with adjustable supply dependence |
Jul. 4, 1995 |
| 5428314 |
Odd/even order distortion generator and distortion cancellation circuit |
Jun. 27, 1995 |
| 5426394 |
Sound intermediate frequency amplifier for a broadcast receiver |
Jun. 20, 1995 |
| 5424680 |
Predistorter for high frequency optical communications devices |
Jun. 13, 1995 |
| 5420536 |
Linearized power amplifier |
May. 30, 1995 |
| 5420538 |
Linear bipolar junction transistor amplifier |
May. 30, 1995 |
| 5414386 |
Muting apparatus in car audio system |
May. 9, 1995 |
| 5412342 |
Power amplifier device comprising a plurality of feedforward distortion compensating circuits in parallel |
May. 2, 1995 |
| 5410282 |
Wide dynamic range amplifier with error correction |
Apr. 25, 1995 |
| 5406227 |
Method and apparatus for controlling RF spectral splatter into adjacent channels when activating an RF transmitter |
Apr. 11, 1995 |
| 5404378 |
Distortion compensating circuit |
Apr. 4, 1995 |
| 5402085 |
Process and device for compensation of phase instabilities of the wave amplified by a microwave tube |
Mar. 28, 1995 |
| 5402086 |
Signal noise reduction system |
Mar. 28, 1995 |
| 5399988 |
F.sub.T doubler amplifier |
Mar. 21, 1995 |
| 5396189 |
Adaptive feedback system |
Mar. 7, 1995 |
| 5396190 |
Circuit for compensating for nonlinear distortion in transmit power amplifier |
Mar. 7, 1995 |
| 5392317 |
Method and apparatus extracting pulse signal |
Feb. 21, 1995 |
| 5386198 |
Linear amplifier control |
Jan. 31, 1995 |
| 5381109 |
Pulse step modulator having faulted module detection and compensation |
Jan. 10, 1995 |
| 5381110 |
Spurious frequency suppressor |
Jan. 10, 1995 |
| 5376896 |
Apparatus and method for reducing VCA distortion and noise |
Dec. 27, 1994 |
| 5374896 |
Distortion compensating circuit of high-frequency power amplifier |
Dec. 20, 1994 |
| 5365187 |
Power amplifier utilizing the vector addition of two constant envelope carriers |
Nov. 15, 1994 |
| 5365189 |
Drift free low noise composite amplifier and method of operation thereof |
Nov. 15, 1994 |
| 5365190 |
Feed-forward digital phase and amplitude correction system |
Nov. 15, 1994 |
| 5365195 |
Volume control apparatus producing reduced noise and distortion |
Nov. 15, 1994 |
| 5363056 |
Circuit for linearization of amplified electronic signals |
Nov. 8, 1994 |
| 5361039 |
Power amplifier device for a composite signal |
Nov. 1, 1994 |
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