Light-receiving amplifier circuit and optical pick-up device...

Details Light-receiving amplifier circuit and optical pick-up device... Light-receiving amplifier circuit and optical pick-up device...

2006-07-03

2008-08-05

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140LS, C330S308000

Reexamination Certificate

active

07408141

ABSTRACT:
The present invention provides a light-receiving amplifier circuit which includes a clipping circuit, can prevent an oscillation at the time of clipping operation, and can freely set clipping voltage. The light-receiving circuit of the present invention includes a photodiode, an operation amplifier, a conversion resistance connected between an output terminal and an inverting input terminal of the operation amplifier, and a clipping circuit which clips output voltage of the operation amplifier to a predetermined value. The clipping circuit includes a PNP transistor which detects a change in the output voltage of the operation amplifier and a voltage source connected to a base of the PNP transistor. Here, when the PNP transistor is turned ON along with an increase of an emitter potential of the NPN transistor which constitutes an output amplifier stage of the operation amplifier, voltage from the voltage source is applied to the base of the NPN transistor via the PNP transistor.

REFERENCES:
patent: 5343454 (1994-08-01), Watanabe et al.
patent: 7030702 (2006-04-01), Denoyer et al.
patent: 2006/0103472 (2006-05-01), Fukuda et al.
patent: 3123708 (2000-10-01), None
an English language Abstract of the corresponding Japanese Laid-Open Patent Publication No. HEI 10-242774, 1998.

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