Circuit for processing signals from a magneto-resistive head

Details Circuit for processing signals from a magneto-resistive head Circuit for processing signals from a magneto-resistive head

1997-07-01

1998-11-10

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327551, 327558, 327174, 327185, 360 46, 360 61, H03K 500

Patent

active

058349693

ABSTRACT:
A signal reproduction circuit used for an MR head has a simple circuit configuration to suppress a disturbance signal caused by the contact between the MR head and a disk, and to remove the ripples completely from the reproduced signal. The signal reproduction circuit used for the MR head includes a first circuit for generating a switching signal in accordance with a disturbance signal extracted from an input data signal, a second circuit including a filter circuit and a switching circuit, the filter having a first and a second cut-off frequency, the switching circuit for switching either the first of second cut-off frequency for outputting an un-suppressed data signal and a suppressed disturbance signal.

REFERENCES:
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patent: 5270875 (1993-12-01), Shah et al.
patent: 5396188 (1995-03-01), Aoki
patent: 5418661 (1995-05-01), Nakamura
patent: 5428314 (1995-06-01), Swafford et al.
patent: 5648738 (1997-07-01), Welland et al.
W. Levin, "Band Switching an Active Filter", IBM Technical Bulletin, vol. 13, No. 3, p. 611, Aug. 1970.

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