Low noise preamplifier for a magneto-resistive head tester

Details Low noise preamplifier for a magneto-resistive head tester Low noise preamplifier for a magneto-resistive head tester

1997-01-21

1998-11-24

Mottola, Steven

Amplifiers

With periodic switching input-output

360 67, 330 69, H03F 102, G11B 502

Patent

active

058413189

ABSTRACT:
The present invention relates to an apparatus and method for amplifying a signal from a MR element of a hard disk drive magnetic recording head having a DC component and an AC component. The apparatus includes an amplifier circuit that amplifies the signal. An offset corrector circuit is coupled to the amplifier circuit and generates an offset signal representative of a complement of the dc component of the signal. A circuit is coupled to the amplifier circuit and the offset corrector circuit that combines the signal and the offset signal to provide an output signal representative of the AC component of the signal.

REFERENCES:
patent: 4463272 (1984-07-01), Tucker
patent: 5508656 (1996-04-01), Jaffard et al.
patent: 5548453 (1996-08-01), Sasaki et al.

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