Circuit device and physical quantity detection device

A circuit device connected to a physical quantity detection element that has a driver and a detector, the circuit device comprising:

• a drive circuit that drives the driver and that generates a periodic signal, based on a signal output from the driver;
• and
• a detection circuit that generates a physical quantity detection signal related to a physical quantity detected by the detector, based on a signal output from the detector,
• the detection circuit including
• an analog front end that amplifies the signal output from the detector,
• an analog-to-digital conversion circuit that converts a signal output from the analog front end into a digital signal,
• a bandpass filter circuit that receives the digital signal output from the analog-to-digital conversion circuit, and
• a demodulation circuit that uses the periodic signal as a detection signal to demodulate a physical quantity signal contained in a signal output from the bandpass filter circuit, based on the detection signal,
• the detection circuit generating the physical quantity detection signal, based on the demodulated physical quantity signal.