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1. (WO2013111521) HALL ELECTROMOTIVE FORCE SIGNAL DETECTION CIRCUIT AND CURRENT SENSOR THEREOF

Pub. No.:    WO/2013/111521    International Application No.:    PCT/JP2013/000065
Publication Date: Fri Aug 02 01:59:59 CEST 2013 International Filing Date: Fri Jan 11 00:59:59 CET 2013
IPC: G01R 33/07
G01R 15/20
H01L 43/06
Applicants: ASAHI KASEI MICRODEVICES CORPORATION
旭化成エレクトロニクス株式会社
Inventors: OKATAKE, Shigeki
岡武 茂樹
NAKAMURA, Takenobu
中村 威信
Title: HALL ELECTROMOTIVE FORCE SIGNAL DETECTION CIRCUIT AND CURRENT SENSOR THEREOF
Abstract:
This invention relates to a Hall electromotive force signal detection circuit and a current sensor thereof that allow for achievement of excellent broadband characteristic and high-speed response as well as high precision at the same time. A difference calculation circuit (15) samples, at timings obtained from chopper clocks generated by a chopper clock generation circuit (14), the components, which are synchronous with the chopper clocks, of output voltage signals from a signal amplification circuit (13) for detection. An integration circuit (16) integrates, in the time domain, outputs of the difference calculation circuit (15). An output voltage signal of the integration circuit (16) is fed back to the signal amplification circuit (13) via a third transconductance element (17).