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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 |
| 4891605 |
Adaptive gain control amplifier |
Jan. 2, 1990 |
| 4890067 |
Common base configuration for an f.sub.T doubler amplifier |
Dec. 26, 1989 |
| 4882547 |
Linearizer control system |
Nov. 21, 1989 |
| 4879519 |
Predistortion compensated linear amplifier |
Nov. 7, 1989 |
| 4878030 |
Linearizer for microwave amplifier |
Oct. 31, 1989 |
| 4870371 |
Network for cascade compensation of the non-linearity of an amplifier |
Sep. 26, 1989 |
| 4866399 |
Noise immune current mirror |
Sep. 12, 1989 |
| 4864246 |
Mobile automatic volume control apparatus |
Sep. 5, 1989 |
| 4857865 |
Self equalizing multi-stage radio frequency power amplifier |
Aug. 15, 1989 |
| 4853652 |
Wide band and low noise amplifier for metric waves |
Aug. 1, 1989 |
| 4849713 |
High-dynamics amplifier stage with distortion detection |
Jul. 18, 1989 |
| 4845441 |
Amplifier circuit with bipolar transistors |
Jul. 4, 1989 |
| 4839608 |
Circuit layout to eliminate alternating voltage interference signals |
Jun. 13, 1989 |
| 4837522 |
Noise reducer for microwave amplifier |
Jun. 6, 1989 |
| 4820997 |
Differential amplifier circuit |
Apr. 11, 1989 |
| 4816771 |
Amplifier arrangement for an adaptive reduction of an unwanted d.c. offset in an input signal and an AM receiver using same |
Mar. 28, 1989 |
| 4814722 |
Amplifier for timed electrical measurement signals |
Mar. 21, 1989 |
| 4812779 |
Low-power feedforward amplifier |
Mar. 14, 1989 |
| 4811422 |
Reduction of undesired harmonic components |
Mar. 7, 1989 |
| 4804904 |
Voltage to current converters for use in an active filter and with a moise reduction circuit |
Feb. 14, 1989 |
| 4804926 |
FT quadrupler amplifier with linearity correction |
Feb. 14, 1989 |
| 4795987 |
Parasitic insensitive switched capacitor filter |
Jan. 3, 1989 |
| 4794348 |
Linear wideband differential amplifier and method for linearizing the same |
Dec. 27, 1988 |
| 4789841 |
Circuit arrangement for noise reduction at the minimum volume setting of an amplifier |
Dec. 6, 1988 |
| 4788508 |
Pop noise suppression circuit for audio amplifier |
Nov. 29, 1988 |
| 4786879 |
Attenuator circuit employing bootstrapping |
Nov. 22, 1988 |
| 4785257 |
Power amplifier circuit for an audio circuit |
Nov. 15, 1988 |
| 4785258 |
CMOS amplifier circuit which minimizes power supply noise coupled via a substrate |
Nov. 15, 1988 |
| 4779057 |
Cascode amplifier with nonlinearity correction and improve transient response |
Oct. 18, 1988 |
| 4775829 |
On-chip voltage stabilizing circuit |
Oct. 4, 1988 |
| 4774475 |
Linearized differential f.sub.T doubler amplifier |
Sep. 27, 1988 |
| 4772855 |
Linearizer for microwave power amplifiers |
Sep. 20, 1988 |
| 4766395 |
Circuits to provide desired conductance characteristics using a FET |
Aug. 23, 1988 |
| 4763081 |
Reducing distortion in active MOSFET-C low pass filters |
Aug. 9, 1988 |
| 4758797 |
Amplifier with compressor and expander function for ground symmetrical electrical signals |
Jul. 19, 1988 |
| 4752743 |
Linearizer for TWT amplifiers |
Jun. 21, 1988 |
| 4749953 |
Operational amplifier or comparator circuit with minimized offset voltage and drift |
Jun. 7, 1988 |
| 4748420 |
Quadcomp amplifier |
May. 31, 1988 |
| 4743859 |
Amplifying circuit arrangement having means for distortion correction |
May. 10, 1988 |
| 4739280 |
Amplifier circuit having reduced crossover distortion |
Apr. 19, 1988 |
| 4737731 |
Method and apparatus for reducing distortion in amplifiers |
Apr. 12, 1988 |
| 4736165 |
Distortion generating circuit |
Apr. 5, 1988 |
| 4733193 |
Arrangement for eliminating signal hum |
Mar. 22, 1988 |
| 4725789 |
Circuit arrangement for a low-noise audio frequency source |
Feb. 16, 1988 |
| 4720685 |
FET transconductance amplifier with improved linearity and gain |
Jan. 19, 1988 |
| 4718100 |
High current demand cable |
Jan. 5, 1988 |
| 4713625 |
Circuit for improving power supply rejection in an operational amplifier with frequency compensation |
Dec. 15, 1987 |
| 4710727 |
Nonlinear distortion synthesizer using over-threshold power-function feedback |
Dec. 1, 1987 |
| 4701717 |
Operating point-stabilized linearized traveling wave tube amplifier |
Oct. 20, 1987 |
| 4701957 |
Dual mode music instrument preamplifier |
Oct. 20, 1987 |
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