Arrangement comprising a magnetic write head, and write amplifie

Details Arrangement comprising a magnetic write head, and write amplifie Arrangement comprising a magnetic write head, and write amplifie

1997-07-15

1998-08-04

Hindi, Nabil

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

327 53, 327 55, 327 66, 330146, 360 46, G11B 502

Patent

active

057903360

ABSTRACT:
A recording apparatus including a magnetic write head and a write amplifier with capacitive current compensation. The write amplifier is made up of four current mirrors which are turned on two at a time by two switchable floating current sources connected between the input terminals of the current mirrors in order to produce a write current of alternating polarity through the write head. The parasitic capacitances across the write head and/or the parasitic capacitances of the write amplifier at the write terminals are neutralized by means of neutralizing capacitors. The high impedance at the terminals of the write head enables the common-mode voltage across the write head to be fixed at any desired voltage value by means of a common-mode circuit.

REFERENCES:
patent: 4551772 (1985-11-01), Sliger
patent: 5282094 (1994-01-01), Ngo
patent: 5287231 (1994-02-01), Shier et al.
patent: 5296975 (1994-03-01), Contreras et al.
patent: 5386328 (1995-01-01), Chiou et al.
patent: 5389832 (1995-02-01), Boerstler et al.

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