Operation methods for active BiCMOS pixel for electronic shutter

Details Operation methods for active BiCMOS pixel for electronic shutter Operation methods for active BiCMOS pixel for electronic shutter

1998-04-02

2000-05-16

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

257223, 257290, 257291, H01L 2700

Patent

active

060640537

ABSTRACT:
Methods of operation of an active pixel sensor cell to provide electronic shuttering and elimination of image lag are disclosed. An active pixel sensor has a photodiode, a bipolar transistor, a pass MOS transistor, and a parasitic MOS transistor. The first method of operation of the active pixel sensor will vary the time the integration time of the active pixel sensor by adjusting the time of a resetting pulse to the anode of the photodiode to eliminate any accumulated charge relative to the integration time. The second method will place the anode of the photodiode in a sleep mode by resetting the anode of the photodiode for a period of time. The relative time of the sleep mode to the integration time will determine the electronic shuttering. The third method to eliminate the image-lag overlaps the read period and the sleep time, and brings the reset biasing voltage source to a lower level to extract all the minority carriers from the base of the bipolar transistor.

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