Detector diodes with bias control loop

Details Detector diodes with bias control loop Detector diodes with bias control loop

2008-07-22

2008-07-22

Epps, Georgia Y. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C327S514000

Reexamination Certificate

active

07402788

ABSTRACT:
Methods and devices provide for a dynamic bias voltage control in detector photodiodes. The methods and systems use a bias control loop to make continuous detections of changes in the effective breakdown current of the detector photodiodes, thereby enabling the devices to change the bias voltage as needed. In one embodiment, a sense diode is added and operated at the breakdown current while the detector diode is operated at a small offset from the breakdown current. As performance conditions change, a feedback loop with the sense diode detects changes in the breakdown current and is used to adjust the bias voltage as necessary. In another embodiment, no sense diode is used. Rather, the detector diode itself is maintained at the breakdown current by a low frequency feedback loop. The optical signal is measured by a high frequency filter.

REFERENCES:
patent: 5548112 (1996-08-01), Nakase et al.
patent: 2003/0066947 (2003-04-01), Alwan et al.

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