| 摘要 |
A method of using a pinned photodiode pixel for high-speed motion-capture CMOS image sensors uses a pinned photodiode in a five-transistor pixel so that the channel region of the photodiode is completely voided of charge after reset and readout operations. An exemplary method includes applying an exposure control clock signal to a gate electrode of an exposure control transistor of a five-transistor pixel, applying a pixel preset voltage to a drain of the exposure control transistor, and switching the exposure control clock signal. The exposure control transistor is coupled between a pinned photodiode of the pixel and the pixel preset voltage. The switching the exposure control clock signal turns off the exposure control transistor at a beginning of an integration cycle after substantially all signal charge has drained out of the pinned photodiode and across the exposure control transistor so that the pinned photodiode is fully voided of majority carriers.
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