PLL for regenerating a synchronizing signal from magnetic storag

Details PLL for regenerating a synchronizing signal from magnetic storag PLL for regenerating a synchronizing signal from magnetic storag

1982-09-08

1985-09-17

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 17, 331 25, 360 371, 375120, H03L 710

Patent

active

045423512

ABSTRACT:
A phase-locked loop circuit, which obtains a signal synchronized with a phase of an input signal, including a synchronizing portion, and a data portion having a voltage controlled oscillator, a frequency phase comparator, a phase comparator, and a control circuit. The frequency phase comparator detects the phase difference and the frequency difference between the input signal and the output of the voltage controlled oscillator and the phase comparator detects the phase difference between the input signal and the output of the voltage controlled oscillator. The control circuit controls the voltage controlled oscillator, at least during a portion of the synchronizing signal portion, in accordance with the output of the frequency phase comparator, and, during the data signal portion, in accordance with the output of the phase comparator.

REFERENCES:
patent: 3950658 (1976-04-01), Mattson
patent: 4365211 (1982-12-01), Lee
Rae, J. W., "Variable Frequency Oscillator Using a Frequency Discriminator", IBM Technical Disclosure Bulletin, vol. 27, No. 1A, Jun. 1984.
Horst Geschwinde, "Einfuhrung in die PLL-Technik", 2nd edition, 1980.
Friedrich Vieweg & Sohn Verlagsgesellschaft m.b.H., Braunschweig/Wiesbaden, p. 124, FIG. 1.

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