SYSTEM AND DEVICE FOR PHYSICAL QUANTITY SENSOR

摘要

PROBLEM TO BE SOLVED: To reduce a circuit scale of a physical quantity sensor system.

SOLUTION: The physical quantity sensor system (11) drives a physical quantity sensor (10) and detects a physical quantity signal (Dphy) from a sensor signal (Ssnc). Analog/digital conversion circuits (102m, 102s) convert a monitor signal (Smnt) and a sensor signal (Ssnc) to a digital monitor signal (Dmnt) and a digital sensor signal (Dsnc). A drive control circuit (103) controls a drive signal (Sdrv) according to the digital monitor signal (Dmnt). A phase adjustment circuit (104) adjusts the phase difference between the digital monitor signal (Dmnt) and the digital sensor signal (Dsnc). A detection circuit (105) detects the physical quantity signal (Dphy) by multiplying the digital monitor signal (Dmnt) of which the phase has been adjusted by the phase adjustment circuit by the digital sensor signal (Dsnc).

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