Magnetic read/write circuit

Details Magnetic read/write circuit Magnetic read/write circuit

1992-05-05

1993-12-14

Hajec, Donald

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of the amplifier

330259, 360 61, G11B 502, G11B 1512, H03F 345

Patent

active

052708837

ABSTRACT:
Disclosed herein is a magnetic read/write circuit which causes only small fluctuation of an output offset in mode switching. When a head (HD3) is switched to a head (HD6) in read mode, amplifiers (2) and (5) are turned off and on respectively. An offset caused by the amplifier (5) is reduced by negative feedback which is provided by an offset detection circuit (46) and an offset adjusting circuit (5) so that an amplifier (19) will not enhance an offset caused by difference between the amplifiers. During a constant period after mode switching, outputs of an amplifier (40) are transmitted to differential output terminals (26, 27). Input ends of the amplifier (40) are so shorted that an offset of the outputs thereof is suppressed small. After a lapse of the constant period, the outputs of the amplifier (19) are transmitted to the differential output terminals (26, 27).

REFERENCES:
patent: 4429282 (1984-01-01), Saari
patent: 4833418 (1989-05-01), Quintus et al.
patent: 5218320 (1993-06-01), Albouy et al.

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