The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 26, 2025
Filed:
May. 26, 2021
Nisshinbo Micro Devices Inc., Tokyo, JP;
Tokyo Institute of Technology, Tokyo, JP;
Alps Alpine Co., Ltd., Tokyo, JP;
Hiroki Sato, Tokyo, JP;
Masayuki Sato, Tokyo, JP;
Takaaki Shirakawa, Tokyo, JP;
Chunhui Pan, Tokyo, JP;
Noboru Ishihara, Tokyo, JP;
Shinji Murata, Tokyo, JP;
NISSHINBO MICRO DEVICES INC., Tokyo, JP;
TOKYO INSTITUTE OF TECHNOLOGY, Tokyo, JP;
ALPS ALPINE CO., LTD., Tokyo, JP;
Abstract
A sensor interface circuit includes a frequency synchronization circuit connectable to a sensor. The frequency synchronization circuit includes: a reference voltage source generating a reference voltage; a current source connected to the reference voltage source, and generating a current by using the reference voltage; a voltage difference detection circuit including first and second input nodes and an output node, generating a control voltage according to a difference between voltages received at the first and second input nodes, one of the voltages received at the first and second input nodes corresponding to a detection value of the sensor; a voltage-controlled oscillation circuit connected to the output node, and generating an oscillation signal according to the control voltage; and a frequency/impedance conversion circuit connected between the voltage-controlled oscillation circuit and the second input node, and converting a frequency of a signal according to the oscillation signal into impedance.