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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 |
| 5923225 |
Noise-reduction systems and methods using photonic bandgap crystals |
Jul. 13, 1999 |
| 5917373 |
Apparatus with reduced A/D dynamic range requirement in a compensating feedback system |
Jun. 29, 1999 |
| 5917375 |
Low distortion amplifier circuit with improved output power |
Jun. 29, 1999 |
| 5912586 |
Feed forward amplifier with digital intermodulation control |
Jun. 15, 1999 |
| 5912588 |
Gain control circuit for a linear power amplifier |
Jun. 15, 1999 |
| 5905760 |
Method of correcting nonlinearities of an amplifier, and radio transmitter employing a method of this type |
May. 18, 1999 |
| 5903185 |
Hybrid differential pairs for flat transconductance |
May. 11, 1999 |
| 5903823 |
Radio apparatus with distortion compensating function |
May. 11, 1999 |
| 5900778 |
Adaptive parametric signal predistorter for compensation of time varying linear and nonlinear amplifier distortion |
May. 4, 1999 |
| 5898338 |
Adaptive digital predistortion linearization and feed-forward correction of RF power amplifier |
Apr. 27, 1999 |
| 5898339 |
Feedforward amplifier |
Apr. 27, 1999 |
| 5892397 |
Adaptive compensation of RF amplifier distortion by injecting predistortion signal derived from respectively different functions of input signal amplitude |
Apr. 6, 1999 |
| 5886572 |
Method and apparatus for reducing distortion in a power amplifier |
Mar. 23, 1999 |
| 5884150 |
Nonlinear compensating circuit |
Mar. 16, 1999 |
| 5880633 |
High efficiency power amplifier |
Mar. 9, 1999 |
| 5877653 |
Linear power amplifier and method for removing intermodulation distortion with predistortion system and feed forward system |
Mar. 2, 1999 |
| 5874856 |
Feed forward amplifier |
Feb. 23, 1999 |
| 5867064 |
Method and apparatus for improving intermodulation in a feed-forward amplifier |
Feb. 2, 1999 |
| 5867065 |
Frequency selective predistortion in a linear transmitter |
Feb. 2, 1999 |
| 5861777 |
Method and apparatus for compensation of phase distortion in power amplifiers |
Jan. 19, 1999 |
| 5862459 |
Method of and apparatus for filtering intermodulation products in a radiocommunication system |
Jan. 19, 1999 |
| 5852521 |
Amplifier circuit suppressing disturbance signal produced by magnetoresistive head |
Dec. 22, 1998 |
| 5850162 |
Linearization of an amplifier employing modified feedforward correction |
Dec. 15, 1998 |
| 5847604 |
Linearizer for linearizing a non-linear component controlled by control voltage |
Dec. 8, 1998 |
| 5838195 |
Reduction of second order harmonic distortion in high power TWT amplifiers |
Nov. 17, 1998 |
| 5818299 |
Power management in a computer |
Oct. 6, 1998 |
| 5815038 |
Distortion compensation circuit |
Sep. 29, 1998 |
| 5808511 |
Active feedback pre-distortion linearization |
Sep. 15, 1998 |
| 5798672 |
Single-output dual-supply class D amplifier |
Aug. 25, 1998 |
| 5796303 |
Popless amplifier |
Aug. 18, 1998 |
| 5796307 |
Amplifying device having input and output nonlinear phase shifters of opposite phase-frequency characteristics |
Aug. 18, 1998 |
| 5796850 |
Noise reduction circuit, noise reduction apparatus, and noise reduction method |
Aug. 18, 1998 |
| 5793253 |
High power solid state microwave transmitter |
Aug. 11, 1998 |
| 5789976 |
Digital adaptive control of feedforward amplifier using frequency domain cancellation |
Aug. 4, 1998 |
| 5789978 |
Ku-band linearizer bridge |
Aug. 4, 1998 |
| 5789979 |
Reduction of excessive spectral power distribution from class-C saturated amplification of a pulsed-carrier signal |
Aug. 4, 1998 |
| 5786728 |
Cuber based predistortion circuit and mobile station using the same |
Jul. 28, 1998 |
| 5781069 |
Pre-post distortion amplifier |
Jul. 14, 1998 |
| 5774018 |
Linear amplifier system and method |
Jun. 30, 1998 |
| 5770971 |
Distortion compensation control for a power amplifier |
Jun. 23, 1998 |
| 5770972 |
Coupling circuit |
Jun. 23, 1998 |
| 5771319 |
Network for influencing signal fields |
Jun. 23, 1998 |
| 5764104 |
Method and system for reducing noise in a hybrid matrix amplifier |
Jun. 9, 1998 |
| 5764780 |
Circuit for eliminating noise of audio signal |
Jun. 9, 1998 |
| 5760646 |
Feed-forward correction loop with adaptive predistortion injection for linearization of RF power amplifier |
Jun. 2, 1998 |
| 5757231 |
Feed-forward amplifying device and base station with feed-forward amplifying device |
May. 26, 1998 |
| 5748037 |
Radio transmitter power amplifier calibration |
May. 5, 1998 |
| 5748042 |
Method for altering a difference frequency signal and amplifier circuit thereof |
May. 5, 1998 |
| 5748678 |
Radio communications apparatus |
May. 5, 1998 |
| 5745006 |
Method of compensating for distortion in an amplifier |
Apr. 28, 1998 |
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