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:
Jan. 04, 2005
Filed:
Jan. 17, 2002
Brian N. Kuo, Saratoga, CA (US);
Ing-jye Lan, Saratoga, CA (US);
Koon Wing Tsang, Fremont, CA (US);
Pei-ling Hsu, Sunnyvale, CA (US);
Brian N. Kuo, Saratoga, CA (US);
Ing-Jye Lan, Saratoga, CA (US);
Koon Wing Tsang, Fremont, CA (US);
Pei-Ling Hsu, Sunnyvale, CA (US);
Capella Microsystems, Inc., San Jose, CA (US);
Abstract
A first device comprising a first current mirror is used to amplify the output of a first photodetector. A second device comprising a current mirror arrangement is employed to amplify the output of a second photodetector. The outputs of the two devices are then compared to provide a signal useful for many applications, including that for determining the position of a rotating member or of a member in relative motion to another member. Preferably, no feedback action is used for the amplification of the output of at least one of the photodetectors.