Signal reproducing circuit adapted to head utilizing magneto-res

Details Signal reproducing circuit adapted to head utilizing magneto-res Signal reproducing circuit adapted to head utilizing magneto-res

1997-10-09

2000-09-12

Loomis, Paul

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 46, 360 61, G11B 502, G11B 509

Patent

active

061186112

ABSTRACT:
A signal reproducing circuit for a magneto-resistive effect head includes a constant current source for supplying a sense current to an MR head in a read state, first constant current sources for supplying first constant currents to a pair of reproduction transistors in the read state, and a capacitor connected between the emitters of the transistors. Furthermore, second constant current sources for supplying second constant currents are connected in parallel with the first constant current sources. Control is given so that when switching an idle state to the read state is commanded, the second constant current sources remain on for a given period of time. Owing to this circuitry, a transient period during which the idle state is switched to the read state or a transient period during which heads are switched in the read state can be shortened to a great extent. Consequently, superposition of an unwanted offset component on a reproduced signal can be suppressed, and a loss in data-handling capacity can be minimized.

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IBM Technical Disclosure Bulletin; "Recovery Circuit for Magneto-Resistive Head Switching"; vol. 33, No. 4, Sep. 1990.

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