Amplification-type solid-state image pickup device...

Details Amplification-type solid-state image pickup device... Amplification-type solid-state image pickup device...

2006-03-14

2006-03-14

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S208100, C348S294000, C348S308000

Reexamination Certificate

active

07012238

ABSTRACT:
An amplification-type solid-state image pickup device of the present invention repeats, in every frame, a signal level readout period, a first reset period, a reset level readout period, a second reset period, and a third reset period in this order. In the first reset period and the third reset period, a MOS transistor for reset is set to execute a soft reset operation with a sub-threshold current, while in the second reset period, the MOS transistor for reset is set to execute a hard reset operation so as to fix the potential of a photon-electron conversion region to a drain potential. This makes it possible to reduce both reset noise and image retention with a simple constitution.

REFERENCES:
patent: 6519371 (2003-02-01), Pain et al.
patent: 2003/0141497 (2003-07-01), Watanabe
patent: 2004/0174450 (2004-09-01), Lee et al.
patent: 2004/0201550 (2004-10-01), Nakamura et al.
patent: 2005/0083422 (2005-04-01), Lee et al.
Analysis and enhancement of low-light level performance of photodiode-type CMOS active pixel imagers operated with sub-threshold reset by Bedabrata Pain et al. in IEEE Workshop on Charge-Couple Devices and Advanced image Sensors, Jun. 1999, p140-143.

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