Low dark current pixel with a guard drive active photodiode

Details Low dark current pixel with a guard drive active photodiode Low dark current pixel with a guard drive active photodiode

2007-12-13

2010-11-09

Epps, Georgia Y (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S208100, C250S2140RC, C348S308000, C257S292000

Reexamination Certificate

active

07829837

ABSTRACT:
A method and apparatus for reducing thermally generated dark current in a CMOS imaging device is disclosed. A photodiode within the imaging device is kept zero-biased, so that the voltage is equal at both ends of the photodiode. This zero-biasing is accomplished using several different techniques, including, alternatively: a transistor operating at its sub-threshold level; a leaky diode; a short-channel MOSFET; or ramping charge injection.

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