Method and apparatus for detecting the position of light...

Details Method and apparatus for detecting the position of light... Method and apparatus for detecting the position of light...

2007-05-15

2007-05-15

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C250S208100, C250S2140SW

Reexamination Certificate

active

10840865

ABSTRACT:
One embodiment of the present invention provides a system for detecting light which is incident to a first semiconductor die. During operation, the system receives light at a photo-detector on the first semiconductor die, wherein associated circuitry converts the received light into a current. In doing so, the associated circuitry biases a gate voltage of an integrating transistor to be close to a threshold voltage of the integrating transistor, and applies the current from the photo-detector to the gate of the integrating transistor so that the current causes a charge to collect at the gate of the integrating transistor. This charge builds up and causes the integrating transistor to switch, thereby indicating that light has been received by the photo-detector.

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patent: 6982406 (2006-01-01), Chen

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