Apparatus for compensating thermal asperity and DC undershoot in

Details Apparatus for compensating thermal asperity and DC undershoot in Apparatus for compensating thermal asperity and DC undershoot in

1997-07-17

1999-12-21

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 25, G11B 509, G11B 502

Patent

active

060057262

ABSTRACT:
A read channel for use in a disk drive having an MR head. The read channel comprises a compensation device which has a high-pass filter (HPF) for compensating a thermal asperity (TA). The read channel suppresses level changes of a data signal which have resulted from TA disturbance present in the data signal. The read channel has a switch circuit connected to the input of the HPF, for canceling the DC undershoot present in the data signal. The switch circuit maintains the DC level of the data signal at zero level while a thermal asperity is being detected in the data signal.

REFERENCES:
patent: 5233482 (1993-08-01), Galbraith et al.
patent: 5497111 (1996-03-01), Cunningham
patent: 5715110 (1998-02-01), Nishiyama et al.
patent: 5808825 (1998-09-01), Okamura
patent: 5818656 (1998-10-01), Klaassen et al.
patent: 5838512 (1998-11-01), Okazaki
K.B. Klaassen, "Magnetic Recording Channel Front-Ends", IEEE Transactions on Magnetics, 4506-4508, Nov. 1991.

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