Data synchronizer with symmetric window generation

Details Data synchronizer with symmetric window generation Data synchronizer with symmetric window generation

1991-04-12

1994-01-11

Pascal, Robert J.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 46, 375120, G11B 509

Patent

active

052787028

ABSTRACT:
A phase-locked system for recovering data from a disk drive includes a phase detector for signalling the difference in phase between incoming delayed data pulses and a phase detection window clock signal. The phase detection window clock signal is derived from one output of an integrated-circuit window generator, driven by the output of a voltage-controlled oscillator whose frequency is controlled by the phase detector. The phase-locked loop is completed by comparing the phase detection window clock signal output of the window generator with the incoming delayed data pulses in the phase detector. Data detection window clock pulses, defining time windows in which the delayed data pulses are exactly centered, are produced at a second output of the window generator which has a line about which it is essentially symmetric, resulting in the two outputs of the window generator being exactly 180.degree. apart in phase from each other.

REFERENCES:
patent: 4580100 (1986-04-01), Suzuki et al.
patent: 4726022 (1988-02-01), Chan et al.
patent: 4933959 (1990-06-01), Knechtel
patent: 5097489 (1992-03-01), Tucci
patent: 5123030 (1992-06-01), Kazawa et al.
Western Digital Corporation Product Specification; WD10C22B; Self-Adjusting Data Separator, published 1988.
Western Digital Corporation Product Specification; WD10C20-05; Self-Adjusting Data Separator.
Western Digital Corporation Product Specification; WD10C21A; Self-Adjusting Data Separator, published 1988.
Western Digital Corporation Product Specification; WD10C20B; Self-Adjusting Data Separator, published 1987.

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