CHOPPER AMPLIFIER CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a chopper amplifier circuit with a simple circuit configuration, high reliability that can be operated at a low voltage. SOLUTION: A chopper modulator 1 applies chopper modulation to an input signal according to a prescribed control signal to provide an output of a chopper modulation signal. An amplifier circuit of a switched operational amplifier 3 amplifies the chopper modulation signal output from the chopper modulator 1 to provide an output of the amplified chopper modulation signal. A chopper demodulator 4 of the switched operational amplifier 3 applies chopper demodulation to the amplified chopper modulation signal output from the amplifier circuit according to the control signal to provide the demodulated output signal from an output terminal as an output of the chopper amplified output signal. A chopper modulator 5 applies chopper modulation to a demodulated signal output from the chopper demodulator 4 to output the chopper modulation signal to an input terminal of the amplifier circuit. COPYRIGHT: (C)2007,JPO&INPIT