Active pixel image sensor with two transistor pixel,...

Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Having insulated electrode

Reexamination Certificate

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C257S291000

Reexamination Certificate

active

06927433

ABSTRACT:
A CMOS Active Pixel Image Sensor is formed by only two transistors. The sensor may be fabricated with very small pixel sizes, which have only two metal contacts in them, have in-pixel offset non-uniformity correction, and bootstrapped reset lines. These features are achieved by employing the transistor body effect as the main photo-generated charge sensing means. The bootstrapped reset lines allow the sensor to operate at low bias voltages. Additional embodiments of the invention include: single line for addressing the pixels, column-clamping circuits to prevent the forward biasing of pixel's p-n junctions and trench isolation to minimize the pixel size.

REFERENCES:
patent: 5241575 (1993-08-01), Miyatake et al.
patent: 5861621 (1999-01-01), Takebe et al.
patent: 6163023 (2000-12-01), Watanabe
patent: 6587146 (2003-07-01), Guidash

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