Light-receiving circuit capable of compensating a...

Details Light-receiving circuit capable of compensating a... Light-receiving circuit capable of compensating a...

2006-07-25

2006-07-25

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S238000, C327S512000, C327S513000, C361S103000

Reexamination Certificate

active

07081609

ABSTRACT:
The present light-receiving circuit provides a function capable of adjusting the temperature dependence and the output of the bias supply circuit independently. The light-receiving circuit includes a bias supply circuit, a voltage divider and a temperature compensation circuit that adjusts a division ratio of the voltage divider so as to depend linearly on the temperature. The temperature compensation circuit has a differential amplifier operating in the inverting mode, and a temperature-sensing resistor that connects the inverting input to the output of the differential amplifier. Since the temperature-sensing resistor has a linear dependence on the temperature and is connected as a feedback resistor, the output of the differential amplifier also depend linearly on the temperature.

REFERENCES:
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patent: 4438348 (1984-03-01), Casper et al.
patent: 6031219 (2000-02-01), Shuke
patent: 6157022 (2000-12-01), Maeda et al.
patent: 6222660 (2001-04-01), Traa
patent: 6313459 (2001-11-01), Hoffe et al.
patent: 6851849 (2005-02-01), Kimura
patent: 2004/0079866 (2004-04-01), Nishiyama
patent: 1989-215140 (1989-08-01), None
patent: 1999-205249 (1999-07-01), None

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