Bias voltage supply circuit for photoelectric converting element

Details Bias voltage supply circuit for photoelectric converting element Bias voltage supply circuit for photoelectric converting element

1998-01-06

2000-02-29

Lee, John R.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214A, 250214AG, 327514, 359194, H01J 4014, H04B 1006

Patent

active

06031219&

ABSTRACT:
A bias voltage supply circuit for an optical receiver includes a high-voltage generation circuit, a current detection circuit, a reference voltage generation circuit, and an operational amplifier. The high-voltage generation circuit supplies a variable bias voltage to an APD having an amplification function. The current detection circuit converts an output current, which is based on the bias voltage supplied from the high-voltage generation circuit, into a voltage signal. The reference voltage generation circuit outputs a constant reference voltage. The operational amplifier outputs a voltage control signal, corresponding to a difference between an output voltage from the current detection circuit and the reference voltage from the reference voltage generation circuit, to the high-voltage generation circuit, thereby variably controlling the bias voltage to be supplied to the photoelectric converting element. The photoelectric converting element generates a photocurrent having a constant amplitude in response to the bias voltage which is supplied from the high-voltage generation circuit upon receiving an optical input.

REFERENCES:
patent: 4467192 (1984-08-01), Velo
patent: 5015839 (1991-05-01), Tanikoshi
patent: 5625181 (1997-04-01), Yasuda et al.
patent: 5750980 (1998-05-01), Swithers et al.

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