发明名称 |
Increasing the dynamic range of CMOS photodiode imagers |
摘要 |
A multiple-step reset process and circuit for resetting a voltage stored on a photodiode of an imaging device. A first stage of the reset occurs while a source and a drain of a pixel source-follower transistor are held at ground potential and the photodiode and a gate of the pixel source-follower transistor are charged to an initial reset voltage having potential less that of a supply voltage. A second stage of the reset occurs after the initial reset voltage is stored on the photodiode and the gate of the pixel source-follower transistor and the source and drain voltages of the pixel source-follower transistor are released from ground potential thereby allowing the source and drain voltages of the pixel source-follower transistor to assume ordinary values above ground potential and resulting in a capacitive feed-through effect that increases the voltage on the photodiode to a value greater than the initial reset voltage.
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申请公布号 |
US7235771(B2) |
申请公布日期 |
2007.06.26 |
申请号 |
US20050191603 |
申请日期 |
2005.07.27 |
申请人 |
CALIFORNIA INSTITUTE OF TECHNOLOGY |
发明人 |
PAIN BEDABRATA;CUNNINGHAM THOMAS J.;HANCOCK BRUCE R. |
分类号 |
H01L27/00 |
主分类号 |
H01L27/00 |
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