Semiconductor photosensor

Details Semiconductor photosensor Semiconductor photosensor

2007-03-27

2007-03-27

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S214100, C250S2140AG, C257S257000

Reexamination Certificate

active

11201254

ABSTRACT:
A semiconductor photosensor comprises: a semiconductor substrate; a first photodiode formed on the semiconductor substrate; a second photodiode formed on the semiconductor substrate; a first amplifier circuit configured to amplify photocurrent from the first photodiode, the first amplifier circuit being formed on the semiconductor substrate; a second amplifier circuit configured to amplify photocurrent from the second photodiode, the second amplifier circuit being formed on the semiconductor substrate and having an amplifying characteristic substantially identical to that of the first photodiode; an infrared transmissive filter configured to attenuate visible light components relative to infrared light components in incident light, the infrared transmissive filter being provided on the second photodiode; and a subtraction circuit configured to output a difference between an output of the first amplifier circuit and an output of the second amplifier circuit, the subtraction circuit being formed on the semiconductor substrate.

REFERENCES:
patent: 6831344 (2004-12-01), Ogawa et al.
patent: 2001/0013573 (2001-08-01), Fujino
patent: 2002/0121652 (2002-09-01), Yamasaki
patent: 2003/0218175 (2003-11-01), Ogawa et al.
patent: 2005/0051704 (2005-03-01), Kashiura et al.
patent: 8-330621 (1996-12-01), None
patent: 2004-214341 (2004-07-01), None
U.S. Appl. No. 11/201,254, Aug. 11, 2005, Takiba et al.
U.S. Appl. No. 11/472,366, Jun. 22, 2006, Takiba et al.

Affiliated with

Also associated with

Rating

Semiconductor photosensor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Semiconductor photosensor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Semiconductor photosensor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3762602