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:
May. 05, 1998
Filed:
Mar. 15, 1996
Applicant:
Inventors:
Thomas W Kelly, South Easton, MA (US);
John Memishian, Newton, MA (US);
Assignee:
Analog Devices, Inc., Norwood, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01P / ; G01R / ;
U.S. Cl.
CPC ...
324661 ; 324662 ; 324686 ; 7351432 ; 361290 ;
Abstract
In a circuit for use with a micromachined device having a movable mass that forms an inner electrode of a differential capacitor, oppositely phased square waves are applied to two outer electrodes of the differential capacitor. A reset voltage is applied to the inner electrode synchronously with the square waves to stabilize and control the potential on the inner electrode. The signal on the inner electrode is demodulated by sampling during a first half of the square wave and a second half of the square wave between applications of the reset pulse to obtain a voltage that does not contain noise due to the reset switch.