公开(公告)号：US10985721B2

公开(公告)日：2021-04-20

申请号：US15966608

申请日：2018-04-30

Applicant: LAPIS Semiconductor Co., Ltd.

Inventor： Koji Yabe

IPC: H03F11/00 ,  H03F3/45 ,  H03F3/00 ,  G01K17/00 ,  G01J5/34 ,  G01J5/12 ,  G01J5/14 ,  G01J1/46

Abstract: A switched capacitor amplifier circuit includes an operational amplifier, a first capacitor and a second capacitor each having one end connected to a negative input terminal of the operational amplifier, a first switching circuit configured to connect the other end of the first capacitor and a signal source during a first operation, a second switching circuit configured to connect the other end of the second capacitor and the output terminal of the operational amplifier so as to connect the output terminal and the negative input terminal of the operational amplifier through the second capacitor during the second operation, and an impedance converter circuit configured to convert an output impedance of the signal source into a specified impedance, the impedance converter circuit being connected between the first switching circuit and the other end of the first capacitor.

公开(公告)号：US11863132B2

公开(公告)日：2024-01-02

申请号：US17167434

申请日：2021-02-04

Applicant: LAPIS Semiconductor Co., Ltd.

Inventor： Koji Yabe

IPC: H03F11/00 ,  H03F3/00 ,  G01K17/00 ,  G01J5/34 ,  G01J5/12 ,  G01J5/14 ,  H03F3/45 ,  G01J1/46 ,  H03G3/30

CPC classification number: H03F11/00 ,  G01J1/46 ,  G01J5/12 ,  G01J5/14 ,  G01J5/34 ,  G01K17/003 ,  H03F3/005 ,  H03F3/45475 ,  H03F3/45968 ,  H03F2200/27 ,  H03F2200/375 ,  H03F2200/411 ,  H03F2203/45356 ,  H03F2203/45512 ,  H03F2203/45514 ,  H03F2203/45528 ,  H03F2203/45616 ,  H03F2203/45631 ,  H03F2203/45634 ,  H03G3/3084

Abstract: A switched capacitor amplifier circuit includes an operational amplifier, a first capacitor and a second capacitor each having one end connected to a negative input terminal of the operational amplifier, a first switching circuit configured to connect the other end of the first capacitor and a signal source during a first operation, a second switching circuit configured to connect the other end of the second capacitor and the output terminal of the operational amplifier so as to connect the output terminal and the negative input terminal of the operational amplifier through the second capacitor during the second operation, and an impedance converter circuit configured to convert an output impedance of the signal source into a specified impedance, the impedance converter circuit being connected between the first switching circuit and the other end of the first capacitor.