Variable gain digital servo system with improved resolution and

Details Variable gain digital servo system with improved resolution and Variable gain digital servo system with improved resolution and

1994-01-14

1995-05-16

Epps, Georgia Y.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4434, G11B 700

Patent

active

054167590

ABSTRACT:
A digital servo system for servo controlling a prescribed function of a host device, e.g., the tracking servo function of an optical disk drive. The digital servo system includes a variable gain amplifier for amplifying an analog error signal issued by the host device, an A/D converter for converting the analog error signal to a digital error signal, an adder for adding a wobbling signal to the digital error signal to produce a composite digital error signal, digital signal processing circuitry for processing the composite digital error signal to produce a processed digital error signal, a D/A converter for converting the processed digital error signal to an analog servo control signal to be used in servo controlling the prescribed function of the host computer. The digital servo system further includes a locking state detection circuit for detecting whether the composite digital error signal is in a locking or pre-locking state, a loop gain detection circuit for detecting the loop gain of the servo system, and a gain controller responsive to the outputs of the locking state detection circuit and the loop gain detection circuit for adjusting the reference voltage applied to the A/D converter and for adjusting the gain of the variable gain amplifier in such a manner as to maximize the dynamic range of the digital servo system.

REFERENCES:
patent: 5109367 (1992-04-01), Yoshikawa

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