Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Patent
1996-10-17
1999-11-16
Kim, W. Chris
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
360 62, 330290, G11B 502, G11B 1512, H03F 130
Patent
active
059868406
ABSTRACT:
A MR head amplifier of the present invention prevents a base potential of a transistor which supplies a current to a MR element from changing in a moment when the MR element changes from a write-state to a read-state. The MR head amplifier includes a loop amplifier that has a non-inverted input terminal connected to one end of a first transistor which supplies a current to a MR element and an inverted input terminal connected to one end of a second transistor which is supplied with a constant current through a constant current source. An output terminal of the loop amplifier is feedback to a base terminal of the first transistor via a first switch and one end of a capacitor whose other end is connected to a ground is connected to an output terminal of the first switch. The loop amplifier includes a second switch connected between the output terminal of the first switch and the base terminal of the first transistor, the second switch being closed during read-state and opened during write-state.
REFERENCES:
patent: 4550351 (1985-10-01), Hamalainen
patent: 5426542 (1995-06-01), Smith
patent: 5534818 (1996-07-01), Peterson
patent: 5694083 (1997-12-01), Umeyama et al.
Tada Masashige
Umeyama Takehiko
Kim W. Chris
Mitsubishi Denki & Kabushiki Kaisha
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