Image sensor with capacitive amplifier and associated methods

Details Image sensor with capacitive amplifier and associated methods Image sensor with capacitive amplifier and associated methods

2005-10-04

2005-10-04

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S208100, C348S301000, C348S308000

Reexamination Certificate

active

06952004

ABSTRACT:
An image sensor includes pixels which are of the four-transistor, PIN photodiode type. In each pixel, the charge on a photodiode is transferred by a transfer gate to a sensing node. Readout of reset and read voltages is via an amplifier. A gain capacitor is connected in feedback across the amplifier. Read and reset gates are controlled so that the pixel is reset to a virtual ground voltage controlled by the gain capacitor. This is independent of the pixel parasitic capacitance.

REFERENCES:
patent: 4902886 (1990-02-01), Smisko
patent: 5742047 (1998-04-01), Buhler et al.
patent: 6532040 (2003-03-01), Kozlowski et al.
patent: 6587142 (2003-07-01), Kozlowski et al.
patent: 0379671 (1990-08-01), None

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