Transconductance amplifier based on self-biased cascode structure

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United States of America Patent

PATENT NO 11121677
SERIAL NO

16625671

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Abstract

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Provided in the present invention is a transconductance amplifier based on a self-biased cascode structure. The transconductance amplifier includes a self-biased cascode input-stage structure constituted by PMOS (P-channel Metal Oxide Semiconductor) input transistors M1, M2, M3 and M4, a self-biased cascode first-stage load structure constituted by NMOS (N-channel Metal Oxide Semiconductor) transistors M5, M6, M7 and M8, a second-stage common-source amplifier structure constituted by an NMOS transistor M9 and a PMOS transistor M10, a bias circuit structure constituted by NMOS transistors M11 and M12 and a PMOS transistor M13, an amplifier compensation capacitor Cc, an amplifier load capacitor CL, a reference current source Iref and a PMOS transistor M0 that provides a constant current source function. Further provided in the present invention is a transconductance amplifier based on a self-biased cascode structure, which adopts an NMOS transistor as an input transistor. Both input transistors and load transistors of a first-stage amplifier of the present invention adopt self-biased cascode structures, such that the output impedance and the DC gain of the first-stage amplifier are increased. Substrate voltages of the MOS transistors of the first-stage amplifier are provided by an amplifier bias circuit. Owing to a connection mode of the compensation capacitor Cc, a higher figure of merit is achieved.

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Patent Owner(s)

Patent OwnerAddress
CHINA ELECTRONIC TECHNOLOGY CORPORATION 24TH RESEARCH INSTITUTENO 14 NANPING GARDEN ROAD NAN'AN DISTRICT CHONGQING CITY 400060

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chen, Guangbing Chongqing, CN 52 56
Deng, Minming Chongqing, CN 5 4
Hu, Gangyi Chongqing, CN 21 28
Li, Ruzhang Chongqing, CN 27 24
Liu, Lu Chongqing, CN 332 1323
Liu, Tao Chongqing, CN 613 3850
Shi, Hanfu Chongqing, CN 3 3
Wang, Jian'an Chongqing, CN 26 11
Wang, Xu Chongqing, CN 406 1331
Wang, Yuxin Chongqing, CN 191 2188
Xu, Daiguo Chongqing, CN 21 12

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