Photo detector circuit having a current mirror circuit

Details Photo detector circuit having a current mirror circuit Photo detector circuit having a current mirror circuit

1998-03-10

1999-11-09

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214LA, 369 4429, H01J 4014

Patent

active

059819367

ABSTRACT:
A photo detector circuit comprises a photodiode for detecting a reflected light beam from an optical recording medium and converting the light beam to a current output, and a current-voltage converter for converting the output current of the photodiode to a proportional voltage. In this circuit, the output current of the photodiode is inputted via a current mirror circuit to the current-voltage converter, so that the S/N is improved and the entire circuit can be formed into a single chip to thereby decrease the number of external elements with another advantage of dimensional reduction.

REFERENCES:
patent: Re34769 (1994-11-01), Yoshimoto et al.
patent: 5453607 (1995-09-01), Ando et al.
patent: 5467336 (1995-11-01), Ando et al.
patent: 5479387 (1995-12-01), Ando et al.
patent: 5523994 (1996-06-01), Ando et al.
patent: 5559769 (1996-09-01), Ando et al.
U.S. application No. 8/704,721, filed Jan 31, 1996.
U.S. application No. 9/129,266, filed Aug. 5,1998.
U.S. application No. 9/129,613, filed Aug. 5, 1998

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