Adaptive preamplifier for resonance tuning useful in a disk driv

Details Adaptive preamplifier for resonance tuning useful in a disk driv Adaptive preamplifier for resonance tuning useful in a disk driv

1995-06-01

1997-09-23

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 65, G11B 502

Patent

active

056710984

ABSTRACT:
A resonant frequency control circuit communicates with a head of a disk drive and the preamplifier of a read channel. The resonant frequency control circuit is useful in achieving peaking of a readback signal generated by reading data from a magnetic disk. The read channel also includes an equalizer circuit for enhancing equalization of the readback signal. A controller communicates with the read channel and the resonant frequency control circuit for, in one embodiment, selectively adding capacitance to that capacitance which is present in the read element of the head and the preamplifier. By controlling the resonant frequency, this desired signal peaking can be achieved, which is related to the frequencies of the coded data on the disk.

REFERENCES:
patent: 4656533 (1987-04-01), Sakai et al.
patent: 4963806 (1990-10-01), Shinohara et al.
patent: 5315450 (1994-05-01), Nagase et al.

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