PHYSICAL QUANTITY DETECTION CIRCUIT AND PHYSICAL QUANTITY SENSOR DEVICE

摘要

A physical quantity detection circuit (12) is used for a physical quantity sensor (10) that outputs a sensor signal according to a physical quantity given externally. In the physical quantity detection circuit (12), an analog-to-digital converter (104) converts an analog sensor signal (Ssnc) to a digital sensor signal (Dsnc). A digital filter (100) attenuates a frequency component of the digital sensor signal (Dsnc) that is higher than a predetermined cutoff frequency. A multiplier (106) multiplies a digital sensor signal (Dps) having passed the digital filter (100) by a digital detection signal (Ddet) to detect a digital physical quantity signal (Dphy).