Level shift circuit of optical disc apparatus

Details Level shift circuit of optical disc apparatus Level shift circuit of optical disc apparatus

1990-05-16

1991-04-02

Psitos, Aristoelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, 369 58, G11B 7095

Patent

active

050051636

ABSTRACT:
A circuit for shifting the level of a signal inputted in the focussing or tracking servocircuit provided with an automatic gain control device in an optical disc apparatus. The circuit comprises a plurality of variable gain amplifiers arranged at a stage prior to detecting a focussing or tracking error and forming the corresponding error signal, inclusive of gain set apparatus for selecting one of a plurality of gains of said gain amplifiers depending on the detected level range of the light quantity reflected from the optical disc.

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