Write drive with current mirrors which reduce feed-through

Details Write drive with current mirrors which reduce feed-through Write drive with current mirrors which reduce feed-through

1984-03-28

1985-11-05

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

G11B 509

Patent

active

045517720

ABSTRACT:
A write driver circuit for a thin film resistive magnetic head has current mirror transistors connected in parallel with the driver transistors which are in an H-configuration. Two resistors connected across the write head have their junction connected to reference potential to create an artificial center tap. In this manner, equal and opposite voltage excursions are produced on both sides of the write head. The transients which would normally be fed through to the read head because of these voltage excursions are cancelled.

REFERENCES:
patent: 4015290 (1977-03-01), Bowers
patent: 4477846 (1984-10-01), Cortnell et al.
patent: 4489285 (1984-12-01), Saro
"Predriver for `H` Configured Write Driver for Magnetic Recording", J. A. Bailey, R. G. Black, Jr. and J. Lewkowicz, IBM Technical Disclosure Bulletin, vol. 23, No. 11, Apr. 1981.

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