Light detecting circuit

Details Light detecting circuit Light detecting circuit

G - Physics

01

J

340/155

G01J 1/46 (2006.01) G01J 1/44 (2006.01) H03F 3/08 (2006.01) H04B 10/158 (2006.01)

Patent

CA 1223938

ABSTRACT OF THE DISCLOSURE 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.

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