Light detecting circuit

Details Light detecting circuit Light detecting circuit

1984-04-04

1986-12-02

Wan, Gene

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330 59, H01J 4014, H03F 1700

Patent

active

046266780

ABSTRACT:
A light detecting circuit in which noise superposed on a bias voltage of a photodiode is substantially canceled without the aid of a filter circuit employing an inductor. The photodiode is connected between a bias voltage terminal and an inverting terminal of a main amplifier, the latter being implemented with a differential amplifier or a comparator. A capacitance device is connected between the same bias voltage terminal and the other (noninverting) input terminal of the main amplifier. The capacitance device may be either a physical capacitor or a second photodiode which, in either case, should have a capacitance equal to the parasitic capacitance of the first photodiode.

REFERENCES:
patent: 3801933 (1974-04-01), Teare

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