Preamplifier bias circuit for use in an AC coupled magnetoresist

Details Preamplifier bias circuit for use in an AC coupled magnetoresist Preamplifier bias circuit for use in an AC coupled magnetoresist

1997-06-12

1999-12-21

Faber, Alan

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

360 66, 360 46, 360 61, G11B 502

Patent

active

060057335

ABSTRACT:
A preamplifier bias circuit for use in an AC coupled magnetoresistive read head amplifier which includes a pair of head contacts, a pair of amplifier inputs, a pair of coupling capacitors and a means for selectively shunting the amplifier inputs and rapidly charge the coupling capacitors. The pair of head contacts and the pair of amplifier inputs couple the preamplifier bias circuit to a magnetoresistive element and a read amplifier, respectively. Each of the coupling capacitors is connected between one of the head contacts and one of the amplifier inputs to block a static potential across the magnetoresistive element. The means for selectively shunting the amplifier inputs selectively provides a low impedance path to rapidly charge the coupling capacitors and clamps the amplifier inputs to a known potential. By selectively providing a low impedance path, the AC coupled magnetoresistive read head amplifier can be protected and its associated delay time prior to operation can be decreased.

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