Adaptive pole-zero cancellation for wide bandwidth magnetoresist

Details Adaptive pole-zero cancellation for wide bandwidth magnetoresist Adaptive pole-zero cancellation for wide bandwidth magnetoresist

1995-10-19

1997-05-27

Kim, W. C.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 67, G11B 509, G11B 502

Patent

active

056337655

ABSTRACT:
An apparatus for the adaptive cancellation of at least a first pole frequency in a magnetoresistive (MR) head device includes a preamplifier coupled to first and second terminals of the MR head. A signal at a pole frequency produced by the preamplifier is cancelled by a zero boost frequency signal generated as a result of a signal across the MR head read by a differential amplifier. The zero boost frequency signal is passed to the read channel coming from the MR head to cancel the pole.

REFERENCES:
patent: 5122915 (1992-06-01), Klein et al.
patent: 5309295 (1994-05-01), Bailey et al.
patent: 5327303 (1994-07-01), Smith
patent: 5426542 (1995-06-01), Smith
patent: 5430592 (1995-07-01), Yoda
Wakimoto et al., "A Low-Power Wide-Band Amplifier Using a New Parasitic Capacitance Compensation Technique," IEEE Journal of Solid-State Circuits, 25:200-206, (Feb., 1990).
Klaassen et al., "Read/Write Amplifier Design Considerations for MR Heads," IEEE Transactions on Magnetics, 31:1056-1061 (Mar., 1995).

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