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:
Nov. 15, 2011
Filed:
Sep. 11, 2008
Navid Yazdi, Ann Arbor, MI (US);
Navid Yazdi, Ann Arbor, MI (US);
Evigia Systems, Inc., Ann Arbor, MI (US);
Abstract
A sensor and sensing method capable of full-differential symmetry to minimize bias drift and improve stability of the sensor output. The sensor includes a sensing element, sense electrodes capacitively coupled to the sensing element to generate capacitive outputs that vary in response to the motion of the sensing element, and a differential readout device. The sense electrodes are electrically separable into at least two pairs of differential sense electrodes. The readout device performs a sampling sequence of at least two sampling cycles during which the readout device samples the capacitive outputs of the sense electrodes and produces at least two differential outputs based on the difference between the capacitive outputs within each pair of differential sense electrodes. The readout device then calculates an average of the differential outputs of the sampling sequence to produce an output of the differential readout device, and thereafter repeats the sampling sequence and calculation.