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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 |
| 5742201 |
Polar envelope correction mechanism for enhancing linearity of RF/microwave power amplifier |
Apr. 21, 1998 |
| 5740453 |
Circuit for reducing audio amplifier noise during powering on and off |
Apr. 14, 1998 |
| 5736898 |
Process and device for linearizing the gain charactristics and phase-frequency characteristics of traveling-wave tubes and transistor amplifiers at different power levels |
Apr. 7, 1998 |
| 5732333 |
Linear transmitter using predistortion |
Mar. 24, 1998 |
| 5729176 |
Linear differential gain stage |
Mar. 17, 1998 |
| 5710521 |
Out-of-band compensation for non-linear device |
Jan. 20, 1998 |
| 5708390 |
Signal amplifier arrangeable in two different configuration modes |
Jan. 13, 1998 |
| 5703529 |
Amplifier circuit with reduced DC power related transients |
Dec. 30, 1997 |
| 5703530 |
Radio frequency amplifier having improved CTB and cross modulation characteristics |
Dec. 30, 1997 |
| 5703531 |
Predistortion linearizer and method employing uniplanar Magic T hybrids |
Dec. 30, 1997 |
| 5699010 |
Differential amplifier circuit |
Dec. 16, 1997 |
| 5699383 |
High-power linear amplification using periodically updated amplitude and phase correction values |
Dec. 16, 1997 |
| 5697081 |
Intermodulation distortion reduction circuit utilizing variable attenuation |
Dec. 9, 1997 |
| 5677646 |
Differential pair amplifier with improved linearity in low-voltage applications |
Oct. 14, 1997 |
| 5675285 |
Multichannel predistortion linearizer for multiple amplifiers with multiple antennas |
Oct. 7, 1997 |
| 5675286 |
Method and apparatus for an improved linear transmitter |
Oct. 7, 1997 |
| 5675287 |
Digital DC correction circuit for a linear transmitter |
Oct. 7, 1997 |
| 5675288 |
Method of linearizing a non-linear amplifier, linearization circuit and amplifier including a circuit of this kind |
Oct. 7, 1997 |
| 5668499 |
Tube type power amplifier with distortion control |
Sep. 16, 1997 |
| 5650758 |
Pipelined digital predistorter for a wideband amplifier |
Jul. 22, 1997 |
| 5642074 |
Amplifier circuit with reduced turn-on and turn-off transients |
Jun. 24, 1997 |
| 5642076 |
No turn-on pop noise amplifier |
Jun. 24, 1997 |
| 5642077 |
Wide band constant gain amplifier |
Jun. 24, 1997 |
| 5642424 |
Device for connecting external sound generator |
Jun. 24, 1997 |
| 5638404 |
Pre-compensated frequency modulation (PFM) |
Jun. 10, 1997 |
| 5631604 |
Waste energy control and management in power amplifiers |
May. 20, 1997 |
| 5625322 |
Amplifier bias control device |
Apr. 29, 1997 |
| 5621354 |
Apparatus and method for performing error corrected amplification in a radio frequency system |
Apr. 15, 1997 |
| 5619168 |
Distortion creation and reduction circuit |
Apr. 8, 1997 |
| 5617058 |
Digital signal processing for linearization of small input signals to a tri-state power switch |
Apr. 1, 1997 |
| 5606286 |
Predistortion linearization |
Feb. 25, 1997 |
| 5604462 |
Intermodulation distortion detection in a power shared amplifier network |
Feb. 18, 1997 |
| 5604463 |
Coupling circuit |
Feb. 18, 1997 |
| 5600472 |
Distortion generating circuit |
Feb. 4, 1997 |
| 5598127 |
Procedure and circuit for adaptive compensation of the gain distortions of a microwave amplifier with linearizer |
Jan. 28, 1997 |
| 5594385 |
Ultra-linear feedforward amplifier with adaptive control and method for adaptive control |
Jan. 14, 1997 |
| 5589797 |
Low distortion amplifier |
Dec. 31, 1996 |
| 5587689 |
Voltage controlled amplifier with a negative resistance circuit for reducing non-linearity distortion |
Dec. 24, 1996 |
| 5579342 |
Pre-compensated frequency modulation (PFM) |
Nov. 26, 1996 |
| 5576659 |
Method and apparatus for signal processing using reference signals |
Nov. 19, 1996 |
| 5576660 |
Broadband predistortion linearizer with automatic temperature compensation for microwave amplifiers |
Nov. 19, 1996 |
| 5574992 |
Method and apparatus for reducing off-channel interference produced by a linear transmitter |
Nov. 12, 1996 |
| 5574994 |
Method of correcting carrier leak in a transmitter |
Nov. 12, 1996 |
| 5570063 |
RF power amplifier with signal predistortion for improved linearity |
Oct. 29, 1996 |
| 5568087 |
Pre-distorting linearization circuit |
Oct. 22, 1996 |
| 5568105 |
Spurious frequency suppressor |
Oct. 22, 1996 |
| 5559467 |
Digital, pulse width modulation audio power amplifier with noise and ripple shaping |
Sep. 24, 1996 |
| 5559468 |
Feedback loop closure in a linear transmitter |
Sep. 24, 1996 |
| 5554958 |
Inverting amplifier having a low noise biasing network |
Sep. 10, 1996 |
| 5551070 |
Cartesian multicarrier feedback |
Aug. 27, 1996 |
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