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Class Information
Number: 330/270
Name: Amplifiers > With semiconductor amplifying device (e.g., transistor) > Including push-pull amplifier > Having d.c. feedback bias control for stabilization
Description: Subject matter with a feedback circuit for direct currents, for the purpose of operating point stabilization.

Patents under this class:

Patent Number Title Of Patent Date Issued
8390742 Semiconductor integrated circuit and video signal output circuit Mar. 5, 2013
8195096 Apparatus and method for enhancing DC offset correction speed of a radio device Jun. 5, 2012
7663442 Data receiver including a transconductance amplifier Feb. 16, 2010
7603084 Method and apparatus for DC offset calibration Oct. 13, 2009
7599670 Dynamic bias for receiver controlled by radio link quality Oct. 6, 2009
7058360 Method and system for stabilizing the performance variation of a radio frequency device Jun. 6, 2006
6975848 Method and apparatus for DC offset removal in a radio frequency communication channel Dec. 13, 2005
6630866 High beta output stage for high speed operational amplifier Oct. 7, 2003
6600371 Low noise amplifier Jul. 29, 2003
6525602 Input stage for a buffer with negative feed-back Feb. 25, 2003
6127888 Power amplification device Oct. 3, 2000
6111464 Amplifier having bias circuit self-compensating for VGS process variation and IDS aging Aug. 29, 2000
5977829 Low distortion current feedback amplifier with dynamic biasing Nov. 2, 1999
5825247 Electric power amplifier and method for its operation Oct. 20, 1998
5825246 Low voltage class AB amplifier Oct. 20, 1998
5537081 No turn-on pop noise amplifier Jul. 16, 1996
5495214 Method and apparatus for controlling the operating point of an amplifier stage Feb. 27, 1996
5361041 Push-pull amplifier Nov. 1, 1994
5237261 Voltage step up regulator Aug. 17, 1993
5229721 Micropower amplifier/transducer driver with signal expansion Jul. 20, 1993
5202646 Output stage for amplifiers Apr. 13, 1993
5175749 Apparatus and method for DC offset correction in a receiver Dec. 29, 1992
5162752 Working point adjusting circuit for a single power amplifier having multiple output channels Nov. 10, 1992
5087890 Amplifier circuit Feb. 11, 1992
5070308 Working point adjusting circuit for a power amplifier Dec. 3, 1991
4922208 Output stage for an operational amplifier May. 1, 1990
4918400 Amplifier circuit Apr. 17, 1990
4888502 Variable bandwidth filter Dec. 19, 1989
4833423 Apparatus and method for a wide-band direct-coupled transistor amplifier May. 23, 1989
4647866 Audio amplifier output stage Mar. 3, 1987
4531100 Amplifier suitable for low supply voltage operation Jul. 23, 1985
4521740 Bias current compensated amplifier Jun. 4, 1985
4499431 Driver circuit configuration for the output stage of electronic power amplifiers Feb. 12, 1985
4491804 Bias circuit which is independent of output device voltage characteristics for biasing an amplifier in class AB operation Jan. 1, 1985
4442409 Push-pull non-complementary transistor amplifier Apr. 10, 1984
4370623 Push-pull amplifier circuit Jan. 25, 1983
4356452 Class A push-pull amplifier with bias controlling circuit Oct. 26, 1982
4336504 Push-pull output circuit Jun. 22, 1982
4283683 Audio bridge circuit Aug. 11, 1981
4237425 Automatic bias adjusting circuit Dec. 2, 1980
4220930 Quasi-linear amplifier with feedback-controlled idling currents Sep. 2, 1980
4095128 Push-pull switching circuit with minority carrier storage delay Jun. 13, 1978
4090139 Complementary symmetry FET mixer circuits May. 16, 1978
4028630 Push-pull amplifier arrangement Jun. 7, 1977

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