HALL ELECTROMOTIVE FORCE SIGNAL DETECTION CIRCUIT AND CURRENT SENSOR

摘要

A Hall electromotive force signal detection circuit in which fluctuations in spike-shaped error signals, which become obstacles to high-precision Hall electromotive force signal detection, have been suppressed. A Hall electromotive force signal detection circuit that uses a plurality of transconductance amplifiers that drive a plurality of Hall elements by a spinning current method, wherein a reference signal Vcom is supplied from a feedback network controller (32) to a Hall signal feedback network (31) that feedback-controls the common voltage of the Hall electromotive force signals from the plurality of Hall elements so as to match the reference signal Vcom, and to an output signal feedback network (20) that feeds back a divided voltage which is the difference between the output voltage and the reference signal Vcom. As a result, fluctuations in spike signals are suppressed.