Versatile phase-locked loop for read data recovery

Details Versatile phase-locked loop for read data recovery Versatile phase-locked loop for read data recovery

1974-09-06

1976-03-16

Kominski, John

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325346, 325419, 329 50, 329126, 331 11, 331 27, 360 51, 360 73, H03D 318

Patent

active

039449408

ABSTRACT:
A clock pulse generating system is disclosed for recovery of read data from magnetic record media comprised of a phase-locked loop for tracking data pulses. The loop employs simple digital logic gates for phase error detection, third-order filtering for the transient phase and frequency error reduction and a voltage controlled oscillator (VCO) comprised of a capacitor charged by current from a voltage controlled current source, voltage threshold detection means, and means responsive to the threshold detection means to quickly discharge the capacitor. The VCO includes a flip-flop at its output to produce a square-wave feedback signal to the phase detection gates and to a data recovery circuit.

REFERENCES:
patent: 3044020 (1962-07-01), Russell
patent: 3469198 (1969-09-01), Madsen
patent: 3657661 (1972-04-01), Jarger
patent: 3813604 (1974-05-01), Denoncourt
patent: 3825844 (1974-07-01), Peterman et al.
patent: 3863156 (1975-01-01), Bogert

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