CHOPPER AMPLIFICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a chopper amplification device that removes a residual error.SOLUTION: A chopper amplification device 10 includes: a chopper modulator 20 for chopper-modulating a predetermined detection signal and a bias voltage according to predetermined control signals; a first differential amplifier 30 for differentially amplifying chopper-modulated signals output from the chopper modulator 20; a chopper demodulator 40 for chopper-demodulating differentially modulated signals output from the first differential amplifier 30; and a second differential amplifier 70 for extracting a signal component of the detection signal from a demodulated signal demodulated by the chopper demodulator 40. First and second high pass filters 50, 51 having different cutoff frequencies for the demodulated signal are connected to input terminals of the second differential amplifier 70.