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. 19, 2015
Filed:
May. 02, 2012
Edward K. Chan, San Diego, CA (US);
John H. Hong, San Clemente, CA (US);
Cheonhong Kim, San Diego, CA (US);
Chong U. Lee, San Diego, CA (US);
Bing Wen, San Diego, CA (US);
Edward K. Chan, San Diego, CA (US);
John H. Hong, San Clemente, CA (US);
Cheonhong Kim, San Diego, CA (US);
Chong U. Lee, San Diego, CA (US);
Bing Wen, San Diego, CA (US);
QUALCOMM MEMS Technologies, Inc., San Diego, CA (US);
Abstract
This disclosure provides systems, methods and apparatus for driving three-terminal electromechanical systems (EMS) devices. The driving systems and methods described herein include a switched capacitor charge injection circuit that is configured to isolate a single EMS device and transfer a desired amount of charge to the isolated device such that the device can be actuated to produce a desired optical, electrical or mechanical effect. The charge injection circuit can include an operational amplifier and can be connected such that the EMS device is placed in the feedback path of the operational amplifier.