SENSOR DEVICE

摘要

A sensor device is provided with a voltage detection type sensor unit (20) for converting a physical quantity into a voltage value and outputting a voltage signal indicating the voltage value; a chopper amplifier unit (10) for generating a modulation signal by chopping the voltage signal output from the sensor unit with a predetermined chopping frequency, amplifying the modulation signal into an amplification signal, then demodulating the amplification signal and outputting it as an output signal; an integration unit (13) including an operational amplifier (14) for amplifying a voltage difference between a voltage at a non- inverting input terminal and a voltage at an inverting input terminal, an input resistor (Rl) connected to the inverting input terminal of the operational amplifier and a capacitor (Cl) connected between the inverting input terminal and an output terminal of the operational amplifier (14) and adapted to sample the output signal output from the chopper amplifier unit (10) at a predetermined sampling frequency and integrate the sampled output signal; and a digital conversion unit for converting the output signal integrated by the integration unit into a digital signal; and a digital conversion unit for converting the output signal integrated by the integration unit into a digital signal.