Amplifier circuit and optical pickup device

Details Amplifier circuit and optical pickup device Amplifier circuit and optical pickup device

2007-03-19

2008-11-11

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140LA, C330S308000, C330S110000

Reexamination Certificate

active

07449670

ABSTRACT:
An amplifier circuit according to the present invention includes: a first operational amplifier having a negative input terminal, a positive input terminal, and an output terminal; a photodiode connected to the negative input terminal; a first resistor inserted between the output terminal and the negative input terminal; and a second resistor inserted between the output terminal and the positive input terminal, in which the amplifier circuit outputs current from the output terminal via the second resistor.

REFERENCES:
patent: 5670775 (1997-09-01), Abraham et al.
patent: 5981936 (1999-11-01), Fujiie
patent: 2003/0164711 (2003-09-01), Ishida
patent: 2004/0081050 (2004-04-01), Yamamoto
patent: 2007/0018079 (2007-01-01), Chato et al.
patent: 2007/0075222 (2007-04-01), Fukuda et al.
patent: 2007/0075223 (2007-04-01), Murao et al.
patent: 10-256841 (1998-09-01), None
patent: 2003152469 (2003-05-01), None
English Language Abstract of JP 10-256841.
U.S. Appl. No. 11/554,742 to Fukuda et al., filed Oct. 31, 2006.

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