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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 |
| 4560946 |
Power amplifier |
Dec. 24, 1985 |
| 4555669 |
Noise reduction by linear interpolation using a single sample-and-hold circuit |
Nov. 26, 1985 |
| 4554514 |
Predistortion circuit with feedback |
Nov. 19, 1985 |
| 4553105 |
Multistage linear amplifier for a wide range of input signal levels |
Nov. 12, 1985 |
| 4550290 |
FET Power amplifying apparatus |
Oct. 29, 1985 |
| 4549146 |
Systems and methods for compensating for element nonlinearities in electronic circuits |
Oct. 22, 1985 |
| 4547741 |
Noise reduction circuit with a main signal path and auxiliary signal path having a high pass filter characteristic |
Oct. 15, 1985 |
| 4547742 |
Amplifier circuit with surge suppression |
Oct. 15, 1985 |
| 4545258 |
Circuit with adjustable amplitude and rolloff frequency characteristics |
Oct. 8, 1985 |
| 4539527 |
Noise reduction by linear interpolation using a dual function amplifier circuit |
Sep. 3, 1985 |
| 4532475 |
Impulse noise reduction by linear interpolation having a deemphasis characteristic |
Jul. 30, 1985 |
| 4532477 |
Distortion compensation for a microwave amplifier |
Jul. 30, 1985 |
| 4532478 |
Phase adjusted feedforward system utilizing a single amplitude/phase equalizer |
Jul. 30, 1985 |
| 4531095 |
Impulse noise reduction by linear interpolation having immunity to white noise |
Jul. 23, 1985 |
| 4531098 |
Wide dynamic range amplifier with second harmonic signal cancellation |
Jul. 23, 1985 |
| 4529945 |
Method of removing distortions in amplifiers |
Jul. 16, 1985 |
| 4523156 |
Anti-distortion anti-transient tone control circuit |
Jun. 11, 1985 |
| 4517518 |
Circuit arrangement for reconstructing noise-affected signals |
May. 14, 1985 |
| 4517521 |
Feed forward circuit and a method for aligning and balancing the same |
May. 14, 1985 |
| 4513752 |
Bipolar sensing system |
Apr. 30, 1985 |
| 4513250 |
Signal cuber |
Apr. 23, 1985 |
| 4510456 |
PDM Amplifier having distortion reduction circuit |
Apr. 9, 1985 |
| 4499431 |
Driver circuit configuration for the output stage of electronic power amplifiers |
Feb. 12, 1985 |
| 4498052 |
Signal detecting circuit |
Feb. 5, 1985 |
| 4498055 |
Circuit arrangements for modifying dynamic range |
Feb. 5, 1985 |
| 4496909 |
Biasing method for improved performance in field effect devices |
Jan. 29, 1985 |
| 4495471 |
Buffer amplifier |
Jan. 22, 1985 |
| 4491803 |
Current-limiting mechanism for a precision differential amplifier |
Jan. 1, 1985 |
| 4490684 |
Adaptive quadrature combining apparatus |
Dec. 25, 1984 |
| 4490686 |
Differential amplifier with common mode rejection means |
Dec. 25, 1984 |
| 4488122 |
Method and apparatus for compensating non-linear phase shift through an RF power amplifier |
Dec. 11, 1984 |
| 4486718 |
High gain transistor amplifier producing an output free from noise carried on the power voltage |
Dec. 4, 1984 |
| 4482866 |
Reference load amplifier correction system |
Nov. 13, 1984 |
| 4481483 |
Low distortion amplifier circuit |
Nov. 6, 1984 |
| 4480231 |
Circuit for reducing offset voltage drift in differential amplifiers |
Oct. 30, 1984 |
| 4476438 |
Multiplier circuit including amplifier with drift compensation circuit |
Oct. 9, 1984 |
| 4472725 |
LC Delay line for feedforward amplifier |
Sep. 18, 1984 |
| 4471318 |
Circuit for noise reduction particularly useful with signal recording/reproducing apparatus |
Sep. 11, 1984 |
| 4471319 |
FET Buffer amplifier with improved noise rejection |
Sep. 11, 1984 |
| 4468626 |
Polyphase PDM amplifier |
Aug. 28, 1984 |
| 4467288 |
Distortion-free complemented error feedback amplifier and method |
Aug. 21, 1984 |
| 4465980 |
Predistortion circuit for a power amplifier |
Aug. 14, 1984 |
| 4462001 |
Baseband linearizer for wideband, high power, nonlinear amplifiers |
Jul. 24, 1984 |
| 4460872 |
Low noise differential amplifier |
Jul. 17, 1984 |
| 4460874 |
Three-terminal operational amplifier/comparator with offset compensation |
Jul. 17, 1984 |
| 4459553 |
D.C. Stabilization circuit for a follower-type amplifier |
Jul. 10, 1984 |
| 4454484 |
Phase-locked loop including an amplifier circuit arrangement |
Jun. 12, 1984 |
| 4453133 |
Active predistorter for linearity compensation |
Jun. 5, 1984 |
| 4451746 |
Non-linear emphasis circuit |
May. 29, 1984 |
| 4447790 |
Distortion eliminating circuit |
May. 8, 1984 |
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