Data filter tuning for constant density recording applications

Details Data filter tuning for constant density recording applications Data filter tuning for constant density recording applications

1992-09-16

1994-07-05

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 51, G11B 5035, G11B 509

Patent

active

053273028

ABSTRACT:
An arrangement for tuning a data filter in a mass storage system. The filter cutoff frequency (low pass) may be set as a percentage above or below the incoming data rate to achieve the desired "eye opening" in read data. The frequency of a reference oscillator in a phase-locked-loop (PLL) and the cutoff frequency of the filter is controlled by a common control signal from the PLL. The PLL, locked to a scaled multiple of the data rate, determines the cutoff frequency of the filter.

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"Design of a 15-MHz CMOS Continuous-Time Filter with On-Chip Tuning", IEEE Journal of Solid-State Circuits, vol. 26, No. 12, Dec. 1991, John M. Khoury, pp. 1988 through 1997.
"Magnetic Recording Handbook Technology and Applications", C. Denis Mee, Eric D. Daniel, McGraw-Hill Publishing Company 1990 pp. 690 through 740.
"Disk Interface Design Buide and Users Manual", National Semiconductor Application Note 413, AN-413, J. Cecil, R. Gopalan, W. Llewellyn, pp. 9-3 through 9-46.

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