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. 19, 2005
Filed:
Nov. 25, 2002
Applicant:
Graham Mcrae Flower, San Jose, CA (US);
Inventor:
Graham McRae Flower, San Jose, CA (US);
Assignee:
Agilent Technologies, Inc., Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J040/14 ; H01L029/786 ;
U.S. Cl.
CPC ...
Abstract
An optical detector and method for detecting incident light utilizes a pair of photosensitive devices in which one of the photosensitive devices is selectively exposed to the incident light to generate differential current signals that can be used to measure the intensity of the incident light. The photosensitive devices may be phototransistors having a silicon-germanium (SiGe) absorption region that is able to convert longer wavelength light, such as 980 nm or 1300 nm light, into current. The SiGe phototransistors may be fabricated on a silicon substrate.