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.
