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. 23, 2013
Filed:
Sep. 17, 2010
Dong Zheng, San Jose, CA (US);
Xijian Lin, Fremont, CA (US);
Joy Jones, Fremont, CA (US);
Intersil Americas Inc., Milpitas, CA (US);
Abstract
A photodetector includes one or more first photodiode regions that are covered by an optical filter configured to reject infrared (IR) light and that produce a first current (I). The photodetector also includes one or more second photodiode regions that are covered by a light blocking material configured to reject visible and infrared light and that produce a second current (I). The photodetector also includes one or more third photodiode regions that are not covered by the optical filter and are not covered by the light blocking material and that produce a third current (I). Additionally, the photodetector includes circuitry configured to produce an output indicative of the first current (I) or a scaled version of the first current (I), minus the second current (I) or a scaled version of the second current (I), minus the third current (I) or a scaled version of the third current (I). The optical filter configured to reject IR light can be, e.g., a dielectric reflective optical coating filter, an IR absorption optical coating filter, or a combination thereof.