Light signal detection circuit

Details Light signal detection circuit Light signal detection circuit

1998-02-12

1999-06-08

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369124, G11B 700

Patent

active

059109386

ABSTRACT:
An output current from the anode side of one photo-diode PD1 of two photo-diodes PD1, PD2 and an output current from the cathode side of the other photo-diode PD2 which serves as an in-phase signal with respect to the first mentioned output current are added in terms of current to convert an added current thus obtained into a voltage signal by a current/voltage converter 1. Thus, circuit such as summing amplifier, etc. can be omitted and this light signal detection circuit is only required to have one circuit/voltage converter 1. As a result, noise at the time of reproduction of a magneto-optical signal can be reduced while holding the circuit scale down to small size. Thus, S/N ratio of the reproduction signal is improved, thus, making it possible to improve, e.g., the error rate in the digital system to much degree. Accordingly, improvements, in reliability /information desity/transmission rate(speed) can be made.

REFERENCES:
patent: 5136569 (1992-08-01), Fennema et al.
patent: 5202875 (1993-04-01), Rosen et al.

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