Patent ID: 6365950
Filing Date: 2002-04-02
Classification: H01L,H04N

Abstract:
A CMOS active pixel sensor comprising:light sensing means for generating an output voltage at an output when light is incident thereupon, said light sensing means having an amount of leakage current before said light incidence; reset means for resetting the output voltage of the light sensing means to an initial reset voltage in response to a reset signal; a sense transistor having a source, a drain coupled to a power source, and a gate coupled to the output of the light sensing means; a select transistor having a drain connected to the source of the sense transistor, for providing a voltage at a source of the sense transistor to a bit line, in response to a select signal; and compensation means for supplying a voltage to the select transistor substantially corresponding to the output voltage of the light sensing means lowered by the leakage current.