公开(公告)号：US20200348347A1

公开(公告)日：2020-11-05

申请号：US16934954

申请日：2020-07-21

Applicant: Alps Alpine Co., Ltd.

Inventor： Kiyoshi SASAI ,  Masahiro KIMURA

IPC: G01R27/26 ,  H03K5/26 ,  H03M1/12

Abstract: A sensor device includes: a sensor unit that generates a detection signal having the same detection frequency as an entered sinusoidal analog signal and matching a physical quantity to be detected; a reference signal generating unit that generates a reference signal having the detection frequency, according to the entered analog signal; converting units that convert the detection signal and reference signal to digital signals in synchronization with a clock signal; a demodulating unit that multiplies the digital detection signal by each of two sinusoidal synchronization signals having the detection frequency, the phases of the two synchronization signals being shifted from each other by one-fourth of a cycle, and generates two demodulated signals free from a harmonic component; and a correcting unit that corrects the demodulated signals according to the digital reference signal so as to suppress variations, in the demodulated signals, caused by variations in the clock signal phase.