Bias circuit for maintaining a constant potential difference bet

Details Bias circuit for maintaining a constant potential difference bet Bias circuit for maintaining a constant potential difference bet

1994-07-08

1996-11-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214C, 327514, 327538, G01J 142

Patent

active

055788157

ABSTRACT:
A bias circuit for applying a bias voltage to an avalanche photodiode APD2 for detecting light comprises a first diode APD1, a power supply V.sub.H connected to the first diode APD1, for applying a voltage to make the diode in breakdown between an anode and a cathode of the first diode APD1, and a constant voltage circuit V2 connected to the avalanche photodiode APD2 for detecting light, for applying a voltage difference of a breakdown voltage generated between the anode and the cathode of the first diode APD1 minus a constant voltage to the avalanche photodiode. The constant voltage is substantially independent from current flowing in the avalanche photodiode APD2 for detecting light to the avalanche photodiode.

REFERENCES:
patent: 4181863 (1980-01-01), Parker
patent: 4236069 (1980-11-01), Laughlin
patent: 4292514 (1981-09-01), Ohtomo
patent: 4599527 (1986-07-01), Beaudet et al.
patent: 4945227 (1990-07-01), Jones et al.
patent: 5194727 (1993-03-01), Johnson et al.

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