Interference suppression subsystem

Details Interference suppression subsystem Interference suppression subsystem

1997-01-03

1998-10-20

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

324225, 324537, 369 55, G01R 3312, H01H 3102, G01N 2772

Patent

active

058251790

ABSTRACT:
A technique for suppression of stray pickup interference signal during testing of a magneto-resistive head assembly with an external exciting magnetic field. An interruptable phase lock loop and an interruptable amplitude lock loop temporarily hold a replica of the stray-pickup interference signal. The method includes: disabling a magneto-resistive sensor while exciting a magneto-resistive head assembly and its connection wires with an exciting magnetic field; providing a stray-pickup output signal indicative of the stray pickup signals caused by the exciting magnetic field; generating a replica signal of the stray-pickup output signal; then enabling the magneto-resistive sensor element of the magneto-resistive head assembly while the magneto-resistive head assembly is magnetically excited to provide a composite output signal; and subtracting the replica signal of the stray-pickup output signal from the composite output signal to cancel the stray-pickup component and to provide an output response signal for the head assembly having an improved signal to stray-pickup signal ratio.

REFERENCES:
patent: 4005358 (1977-01-01), Foner

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