Photodetection circuit

Details Photodetection circuit Photodetection circuit

2007-03-27

2007-03-27

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C398S202000

Reexamination Certificate

active

10817578

ABSTRACT:
In a photo detection arrangement, the current through a detector10is sensed by a series resistor Rs and amplified and amplified at21. The output of the amplifier is compared with a reference voltage23, which is chosen to correspond to an overload input applied to the detector. When the comparator22triggers, a latch24is set, which controls a switch25to remove the supply voltage to the detector applied to the detector by power amplifier14. In this way, protection is afforded to the detector10without recourse to a high value series resistor. Moreover, the latch provides an output to demonstrate that an overload has occurred.

REFERENCES:
patent: 3560755 (1971-02-01), Blaise
patent: 5311451 (1994-05-01), Barrett
patent: 6535157 (2003-03-01), Garrity
patent: 6643472 (2003-11-01), Sakamoto et al.
Schlumberger, “Photodetector Device, Especially for Reflectometers”, (FR2658605), Aug. 23, 1991, EPO abstract and p. 2, Line 14-p. 4, line 24.
Nippon Electric Co, “Optical Reception Circuit”, (JP3126335), May 29, 1991, PAJ Abstract; fig 1 and fig 2.
Fufitsu Ltd., “Photo Receiver Circuit”, (JP55064452), May 15, 1980, PAJ abstract and fig 1.

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