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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
8705752 Low frequency noise reduction circuit architecture for communications applications Apr. 22, 2014
8704595 Predistortion apparatuses and methods Apr. 22, 2014
8693962 Analog power amplifier predistortion methods and apparatus Apr. 8, 2014
8692614 Timing alignment for power amplifier Apr. 8, 2014
8686793 Amplifier device with reiterable error correction scheme with balanced negative feedback Apr. 1, 2014
8686791 Amplifying apparatus and distortion compensation method Apr. 1, 2014
8681840 Transceivers having loopback switches and methods of calibrating carrier leakage thereof Mar. 25, 2014
8660208 Apparatus and methods for QAM modulation using dual polar modulation Feb. 25, 2014
8655292 Amplifier circuit, transmitter, and method of controlling amplifier circuit Feb. 18, 2014
8655289 Distortion compensation device, transmitter, and distortion compensation method Feb. 18, 2014
8654991 Audio signal amplifier circuit Feb. 18, 2014
8654889 Adaptive compensation systems for mitigating distortion due to nonlinear power amplifiers Feb. 18, 2014
8653892 Systematic intermodulation distortion calibration for a differential LNA Feb. 18, 2014
8649746 Apparatus and method for processing reduced bandwidth envelope tracking and digital pre-distortion Feb. 11, 2014
8649744 Radio-frequency transmitter, such as for broadcasting and cellular base stations Feb. 11, 2014
8649743 Transmitter linearized using inversing and non-inversing transform processing sections and method therefor Feb. 11, 2014
8648659 Digital pre-distortion power amplifying apparatus and method for digitally controlling synchronization thereof Feb. 11, 2014
8648658 Generation of pre-distortion coefficients Feb. 11, 2014
8645884 Multi-layer memory structure for behavioral modeling in a pre-distorter Feb. 4, 2014
8639192 RF feedback receiver arrangement, RF transmit arrangement and RF transceiver arrangement Jan. 28, 2014
8633769 Dual loop adaptation digital predistortion architecture for power amplifiers Jan. 21, 2014
8630598 Methods and apparatus for measuring and/or using transmitter and/or receiver IQ imbalance information and/or DC offset information Jan. 14, 2014
8626089 Adaptive predistorter coupled to a nonlinear element Jan. 7, 2014
8624670 Method and apparatus for improving digital pre-distortion performance Jan. 7, 2014
8619847 Reconditioning equalizer filter for non-constant envelop signals Dec. 31, 2013
8618880 Power amplifier pre-distortion Dec. 31, 2013
8611459 Transmitter linearized using look-up table with unadaptable data and method therefor Dec. 17, 2013
8611451 Precoder coefficient optimization method and apparatus for communications systems Dec. 17, 2013
8610500 Orthogonal basis function set for digital predistorter Dec. 17, 2013
8610499 Radio frequency (RF) amplifier utilizing a predistortion circuit and related techniques Dec. 17, 2013
8605822 Apparatus and method for transmitting and receiving data Dec. 10, 2013
8594583 Apparatus and method for radio frequency reception with temperature and frequency independent gain Nov. 26, 2013
8588333 RF transmitter and method of operation Nov. 19, 2013
8588330 Quadrature communications device with I antennas and Q antennas and related methods Nov. 19, 2013
8587381 Even order distortion cancellation in single-ended input, differential output amplifiers using feed-back Nov. 19, 2013
8587378 Analog pre-distortion linearizer Nov. 19, 2013
8587375 Power amplifier linearization method and apparatus Nov. 19, 2013
8576945 Method of and apparatus for signal amplification Nov. 5, 2013
8571495 Distortion compensation apparatus and method Oct. 29, 2013
8565699 Setting of power amplifier control voltage Oct. 22, 2013
8564368 Digital Predistorter (DPD) structure based on dynamic deviation reduction (DDR)-based volterra series Oct. 22, 2013
8558616 Amplifying apparatus Oct. 15, 2013
8558615 Apparatus for and method of controlling a predistorter, and method of detecting power control state Oct. 15, 2013
8553802 Quadrature communications device with I antennas and Q antennas and modulated power supply and related methods Oct. 8, 2013
8547174 Broadband linearizer with combined second and third order generation with adjustable tilt Oct. 1, 2013
8542062 Adaptive digital pre-distortion method and device to enhance the power utility of power amplifiers in wireless digital communication applications Sep. 24, 2013
8537043 Digital-to-analog converter with controlled gate voltages Sep. 17, 2013
8537041 Interpolation-based digital pre-distortion architecture Sep. 17, 2013
8536943 Selective narrowband feedback for a digital predistorter Sep. 17, 2013
8536942 Power amplifier Sep. 17, 2013

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