Photoelectric current and voltage converting circuit

Details Photoelectric current and voltage converting circuit Photoelectric current and voltage converting circuit

2005-10-18

2005-10-18

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C330S110000

Reexamination Certificate

active

06956195

ABSTRACT:
A photoelectric current and voltage converting circuit includes a light receiving element, an amplifier, a feedback resistor, an offset resistor, a constant current source, and a comparator. A feedback resistor is connected between the input and the output of the amplifier and converts photo current into voltage. An terminal of the offset resistor is connected to the output of the amplifier. The constant current source is connected to another terminal of the offset resistor. The comparator compares the connected point of the offset resistor and the constant current source with a reference voltage and outputs a binary signal. The reference voltage is an input voltage of the amplifier or the divided voltage of the intermediate point of the feedback resistor.

REFERENCES:
patent: 5061859 (1991-10-01), Lovelace et al.
patent: 5287107 (1994-02-01), Gampell et al.
patent: 5406071 (1995-04-01), Elms
patent: 6166566 (2000-12-01), Strong
patent: 2031630 (1980-04-01), None
patent: S63-236971 (1988-10-01), None
patent: 3121339 (2000-10-01), None

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