Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2006-12-05
2006-12-05
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S2140AG, C348S241000, C348S300000
Reexamination Certificate
active
07145123
ABSTRACT:
A light sensing cell comprising output circuitry for generating an output voltage depending on the voltage of a sensing node, the voltage of the sensing node varying as a function of a received light; a reset transistor operable to force the voltage of the sensing node to a reset voltage; a feedback loop including an operational amplifier operable to add through a capacitive voltage divider a correction voltage to the voltage of the sensing node, said correction voltage depending on the output voltage; and preset mean circuitry for, during the operation of the reset transistor and until the amplifier is operated, setting the input of the capacitive voltage divider to a predetermined voltage.
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Pain B. et al. “Reset noise suppression in two-dimensional CMOS photodiode pixels through column-based feedback-reset” International Electron Devices Meeting 2002. IEDM. Technical Digest. San Francisco, CA, Dec. 8-11, 2002, New York, NY: IEEE, US, Dec. 8, 2002, pp. 809-812, XP010626163 ISBN: 0-7803-7462-2.
Benthien Stephan
Lulé Tarek
Allen Stephone B.
Jorgenson Lisa K.
Morris James H.
STMicroelectronics S.A.
Wolf Greenfield & Sacks P.C.
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