Write precompensation with frequency synthesizer

Details Write precompensation with frequency synthesizer Write precompensation with frequency synthesizer

1991-06-14

1994-06-28

Pascal, Robert J.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Pulse crowding correction

360 46, 360 51, 360 53, 307511, 307516, 307527, 328155, G11B 509

Patent

active

053252411

ABSTRACT:
A write precompensation circuit employs a frequency synthesizer for providing a variable timing signal linked to variable transfer rate in a track zone recording system of a disk drive. The synthesizer also provides an operating frequency current sense signal that is used to generate bit shift of data bits being recorded. A ramp voltage on a ramp capacitor and a logic signal from a bit shift decision circuit are determinative of the magnitude and direction of bit shift, early or late. The VCO and its capacitor are formed on the same IC chip as the ramp capacitor thereby minimizing mismatch due to tolerances inherent in production and operation of electrical components.

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patent: 4851932 (1989-07-01), Scheer et al.
patent: 4922141 (1990-05-01), Lofgren et al.
patent: 5187615 (1993-02-01), Miyazawa

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