Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2007-02-27
2007-02-27
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S2140AG, C348S308000
Reexamination Certificate
active
10813073
ABSTRACT:
Signals from an imager pixel photodetector are received by an amplifier having capacitive feedback, such as a capacitive transimpedance amplifier (CTIA). The amplifier can be operated at a low or no power level during an integration period of a photodetector to reduce power dissipation. The amplifier can be distributed, with an amplifier element within each pixel of an array and with amplifier output circuitry outside the pixel array. The amplifier can be a single ended cascode amplifier, a folded cascode amplifier, a differential input telescopic cascode amplifier, or other configuration. The amplifier can be used in pixel configurations where the amplifier is directly connected to the photodetector, or in configurations which use a transfer transistor to couple signal charges to a floating diffusion node with the amplifier being coupled to the floating diffusion node.
REFERENCES:
patent: 6130423 (2000-10-01), Brehmer et al.
patent: 6552324 (2003-04-01), Kothari et al.
patent: 6952004 (2005-10-01), Henderson
patent: 6975356 (2005-12-01), Miyamoto
Fossum Eric R.
Olsen Alf
Rossi Giuseppe
Dickstein & Shapiro LLP
Luu Thanh X.
Micro)n Technology, Inc.
Yam Stephen
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