Phase-lock oscillator

Details Phase-lock oscillator Phase-lock oscillator

1981-01-30

1983-06-28

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 51, 360 78, G11B 2110

Patent

active

043909108

ABSTRACT:
A phase-lock oscillator for use in conjunction with a rotatable servo surface having a servo encoding scheme of timing information and position-indicating-information, including a VCO, a phase-frequency detector, responsive to two input signals, for generating a phase and frequency error signal to control the output frequency signal of the VCO, and a control circuit for generating the two input signals in response to the timing information and output frequency signal, the control circuit being substantially digital and having passive delay lines of short delay and having a lock detector to indicate acquisition or loss of synchronization of the phase-lock oscillator with the timing information.

REFERENCES:
patent: 3534344 (1970-10-01), Santana
patent: 3887942 (1975-06-01), Horowitz
patent: 4068269 (1978-01-01), Commander et al.
patent: 4214279 (1980-07-01), Oswald

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