Magnetic recording with bias and data mixing circuit

Details Magnetic recording with bias and data mixing circuit Magnetic recording with bias and data mixing circuit

1976-06-29

1978-03-28

Lucas, Jay P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 66, G11B 502

Patent

active

040818454

ABSTRACT:
A magnetic recording head driving circuit includes a single operational differential amplifier which mixes the bias signals with the data signals, the signal level of the two signals being separately controlled. The output of the amplifier is applied to the recording head through an impedance matching network. The impedance matching network converts the relatively high inductive impedance of the head to a substantially and effectively resistive load, matching the output impedance of the amplifier at the frequency of the bias signal.

REFERENCES:
patent: 3324250 (1967-06-01), Skov
patent: 3766329 (1973-10-01), Katoh
patent: 3806828 (1974-04-01), Johnson
patent: 4015290 (1977-03-01), Bowers
IBM Technical Disclosure Bulletin, vol. 18, No. 11, 4/76, p. 3540, Record Current Driver for Battery Op. Rec. by A. Higgenbotham.

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