Physical Quantity Detection Circuit, Physical Quantity Sensor, And Method Of Operation Of Physical Quantity Detection Circuit

A physical quantity detection circuit includes an analog/digital conversion circuit having an input capacitance and sampling an analog signal in the input capacitance to convert the analog signal into a digital signal, a precharge circuit for precharging the input capacitance before the analog/digital conversion circuit sample the analog signal in the input capacitance, a digital arithmetic circuit for performing arithmetic processing to the digital signal, and a reference voltage circuit for supplying a power supply voltage to the precharge circuit and the digital arithmetic circuit, wherein the arithmetic processing start timing and the arithmetic processing end timing of the digital arithmetic circuit are set to the timings avoiding the precharge period in which the precharge circuit precharges the input capacitance.