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:
Oct. 18, 2011
Filed:
Sep. 21, 2007
Yoichi Nagata, Saitama, JP;
Tohru Yanagisawa, Tokyo, JP;
Yoichi Nagata, Saitama, JP;
Tohru Yanagisawa, Tokyo, JP;
Citizen Holdings Co., Ltd., Nishitokyo-shi, Tokyo, JP;
Abstract
A physical quantity sensorcomprises a driving circuitthat drives a sensor element based on a reference signal; the sensor elementthat is driven by the driving circuitto convert an externally applied physical quantity to an electrical signal; and an amplifier circuitthat amplifies an output signal of the sensor element. The driving circuitcontrols a driving signal, which drives the sensor element, based on the reference signal so that the driving signal is at a fixed level, and the amplifier circuithas a gain characteristic that amplifies the output signal in a direction reverse to a direction in which the reference signal varies or the driving signal of the driving circuit varies. This configuration allows the physical quantity sensor to reduce output level variations in the sensor output against signal level variations in the reference signal and to make the sensitivity constant.