Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Reexamination Certificate
2006-05-16
2006-05-16
Allen, Stephone B. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
C250S2140RC, C327S514000, C330S308000
Reexamination Certificate
active
07045762
ABSTRACT:
In a photocurrent-to-voltage conversion apparatus for converting a photocurrent flowing through a light receiving element into a detection voltage, an amplifier, a feedback resistor and a clamping MOS transistor are provided. The amplifier has an input connected to the light receiving element and an output for generating the detection voltage, and includes (2n+1) inverter stages connected in series where n is 1, 2 . . . . The feedback resistor and the clamping transistor are connected between the output and input of the amplifier. The clamping MOS transistor is controlled by an output voltage of a non-final inverter one of the inverter stages.
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patent: 6307433 (2001-10-01), Ikeda
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patent: 61 041213 (1986-02-01), None
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Allen Stephone B.
Ellis Suezu
NEC Compound Semiconductor Devices Ltd.
Young & Thompson
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