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:
Jul. 13, 2004
Filed:
Mar. 11, 2003
Applicant:
Inventors:
David C. Hollocher, Norwood, MA (US);
John Memishian, Newton, MA (US);
Assignee:
Analog Devices, Inc., Norwood, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01P 1/513 ;
U.S. Cl.
CPC ...
G01P 1/513 ;
Abstract
An accelerometer had a movable electrode between two fixed electrodes to form a differential capacitor. Drivers provide AC drive signals to the fixed electrodes. The movable electrode is coupled through reading circuitry to an output terminal. In response to a sensed acceleration, feedback is provided from the output terminal to one or both drivers to null any AC signal on the movable electrode and to keep the electrostatic forces between the movable electrode and each of the fixed electrodes equal.