Current mirror amplifier for use in an optical data medium drivi

Details Current mirror amplifier for use in an optical data medium drivi Current mirror amplifier for use in an optical data medium drivi

1988-06-28

1991-04-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214AG, 250214A, 307270, 369 4429, G01J 120, H03K 301

Patent

active

050049011

ABSTRACT:
An optical data medium driving apparatus which constitutes amplifiers for an output current signal of a photosensor including a plurality of current mirror circuits having different amplification factors in order to switch, in a wide range, the output current signal of the photosensor. The photosensor detects a quantity of the reflected light corresponding to a variation of the quantity of reflected light from an optical data medium having various characteristics. The output is obtained with high accuracy and in a wide band. A servo-circuit is used for an AGC circuit and normalizes a difference signal from each light receiving surface at a photosensor having a plurality of light receiving surfaces. An A/D converter is given the difference signal as an analog input signal and the sum signal as the reference input signal. The A/D converter outputs an offset binary type digital signal, thereby being inexpensive to produce, easy to be integrated having high function, and high in reliability.

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Mitchell, "Monolithic Current Source", IBM Tech. Dis. Bull., vol. 13, No. 12, 5/71, p. 3720.
Ito et al., "Improvement of Focusing and Tracking Servos in Optical Disk Memory", SPIE, vol. 529, Optical Mass Data Storage, 1985, pp. 145-9.

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