HALL ELECTROMOTIVE FORCE SIGNAL DETECTION CIRCUIT AND CURRENT SENSOR THEREOF

摘要

The present invention relates to a hall electromotive force signal detection circuit and a current sensor thereof each of which is able to achieve excellent wide-band characteristics and fast response as well as high accuracy. A difference calculation circuit (15) samples a component synchronous with a chopper clock generated by a chopper clock generation circuit (14), out of an output voltage signal of a signal amplifier circuit (13), at a timing obtained from the chopper clock, so as to detect the component. An integrating circuit (16) integrates an output from the difference calculation circuit (15) in the time domain. An output voltage signal from the integrating circuit (16) is fed back to a signal amplifier circuit (13) via a third transconductance element (17).