CMOS image sensor with active reset and 4-transistor pixels

Details CMOS image sensor with active reset and 4-transistor pixels CMOS image sensor with active reset and 4-transistor pixels

2007-10-09

2007-10-09

Casler, Brian L. (Department: 3737)

Television

Camera, system and detail

Solid-state image sensor

C348S241000, C348S302000, C348S310000

Reexamination Certificate

active

10413892

ABSTRACT:
A CMOS image sensor implementing a low noise active reset operation uses control circuitry outside a pixel sensor array and transistors in a pixel sensor as parts of an amplifier that charges a photodiode node. In one configuration, a reference transistor in the control circuit controls a current mirrored to a column line, and each pixel sensor in the corresponding column contains a transistor that acts as half of a differential pair when the row containing the pixel sensor is selected. A 4-transistor pixel sensor can be implemented using only NMOS transistors with PMOS transistors in the control circuitry used to complete an amplifier circuit.

REFERENCES:
patent: 6424375 (2002-07-01), Fowler
patent: 6777660 (2004-08-01), Lee
patent: 2002/0024058 (2002-02-01), Marshall et al.

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