公开(公告)号：US11984859B2

公开(公告)日：2024-05-14

申请号：US17428637

申请日：2019-03-25

Applicant: SOUTH CHINA UNIVERSITY OF TECHNOLOGY

Inventor： Zhiming Liang ,  Bin Li ,  Zhaohui Wu

IPC: H03F1/02 ,  H03F3/387 ,  H03F3/45

CPC classification number: H03F3/387 ,  H03F3/45475

Abstract: A chopper amplifying circuit employing a negative impedance compensation technique, including a differential input end, a first-level chopper switch, a first-level amplifying circuit, a second-level chopper switch, a second-level amplifying circuit, a negative impedance converting circuit, a negative feedback unit, an input capacitor, and a differential output end, is provided. The differential input end is connected to the first-level chopper switch. An output terminal of the first-level chopper switch is connected to the first-level amplifying circuit through the input capacitor. The first-level amplifying circuit is connected to the second-level chopper switch, which is connected to the second-level amplifying circuit. The second-level amplifying circuit is connected to the differential output end, and is also connected to a feedback input end of the first-level amplifying circuit through the negative feedback unit. The negative impedance converting circuit is parallel-connected to a signal input end of the first-level amplifying circuit.