Control loop apparatus or current measuring circuit...

Details Control loop apparatus or current measuring circuit... Control loop apparatus or current measuring circuit...

2006-06-27

2006-06-27

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S214100

Reexamination Certificate

active

07067788

ABSTRACT:
An avalanche photodiode having an operating voltage greater than a DC power supply rail is connected to the rail via a controlled DC-DC converter having an output voltage that drives the photodiode and meets the photodiode voltage supply needs. A measure of the current flowing from the rail to the converter determines the value of a control signal for the converter output voltage. The photodiode current is computed from the current measure and the control signal value.

REFERENCES:
patent: 4540952 (1985-09-01), Williams
patent: 6188059 (2001-02-01), Nishiyama
patent: 0 933 887 (1999-01-01), None
Patent Abstracts of Japan, Optical Reception Circuit, Pub. Feb. 5, 1983, Appln. Oct. 28, 1981, Appln. No. 56171353, NEC CORP., Shimodaira Risuke, vol. 007, No. 166 (E-188).
Patent abstracts of Japan, Gain Control Method for Avalanche Photodiode, Pub. May 25, 1993, Appln. Nov. 7, 1991, Appln. No. 03291226, Sumitomo Electric Ind. Ltd., Noma Takashi, vol. 17, No. 504 (E-1430).

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