Zero DC current readout circuit for CMOS image sensor using...

Details Zero DC current readout circuit for CMOS image sensor using... Zero DC current readout circuit for CMOS image sensor using...

2005-03-08

2005-03-08

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

Reexamination Certificate

active

06864476

ABSTRACT:
A method of reading out a light signal from a pixel is disclosed. The method comprises first charging a capacitor to a predetermined voltage during a precharge stage. Next, during a readout stage, discharging the capacitor for a predetermined length of time through a pixel output transistor. The pixel output transistor is modulated by the light signal by applying the light signal to the gate of the pixel output transistor. Finally, the output signal is determined to be the voltage held by the capacitor.

REFERENCES:
patent: 5869857 (1999-02-01), Chen
patent: 5969758 (1999-10-01), Sauer et al.
patent: 6040570 (2000-03-01), Levine et al.
patent: 6054704 (2000-04-01), Pritchard et al.
patent: 6297492 (2001-10-01), Clark

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