Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Charge transfer device
Patent
1995-03-21
1997-07-22
Thomas, Tom
Active solid-state devices (e.g., transistors, solid-state diode
Field effect device
Charge transfer device
257444, 257222, 257 84, 257 80, 257239, 257228, 257233, 348226, 348228, 348294, 348297, 348310, G03B 300, H01J 4014, H01L 2714
Patent
active
056506430
ABSTRACT:
A light receiving device includes, in addition to a photodiode and a reset element, a comparator formed by a first and a second MOS transistor and a counter. The comparator compares an output potential of the photodiode applied to a gate electrode of the first MOS transistor with a threshold potential externally applied to a gate electrode of the second MOS transistor. The counter counts a time duration from a point of time when the photodiode is reset by the switching element to a point of time at which the output potential of the photodiode exceeds the threshold potential, and outputs the time duration in a numeral value corresponding to the quantity of light incident on the photodiode. The required light sensitivity can be maintained even when the quantity of light is either large or small. Also, non-destructive reading can be carried out.
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NEC Corporation
Thomas Tom
Williams Alexander Oscar
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