Disc drive with write precompensation using window/pulse timing

Details Disc drive with write precompensation using window/pulse timing Disc drive with write precompensation using window/pulse timing

1992-07-22

1994-08-02

Shepperd, John

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

G11B 509

Patent

active

053351185

ABSTRACT:
A peak shift detection circuit receives digitized read data and provides a temporal measurement output representative of peak shift of data pulses read from a magnetic storage medium. A random data pattern is written upon the magnetic storage medium. The peak shift detection circuit uses a precision delay circuit to delay a digitized read data signal. The delay signal is applied to a linear ramp circuit. The linear ramp circuit triggers the charging of a capacitor through a constant current source. This generates a linear ramp which is applied to a flash analog-to-digital converter. The conversion by the flash analog-to-digital is triggered by a generated data window signal. The digitized output of the flash analog-to-digital converter is applied to a time conversion circuit. The output of this circuit is a temporal measurement of the spacing between a data pulse and the following edge of a data window. This time measurement is then used to calculate the amount of write precompensation necessary to correct peak shifting.

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