Bias servo loop for magneto-resistive read/write head

Details Bias servo loop for magneto-resistive read/write head Bias servo loop for magneto-resistive read/write head

1992-12-31

1994-04-05

Shepperd, John

Dynamic magnetic information storage or retrieval

Head

Hall effect

360 66, G11B 5127, G11B 503

Patent

active

053010809

ABSTRACT:
A bias current servo loop for a magneto-resistive recording head detects distortion in the read signal from the MR head, and adjusts the operating point for the head to minimize the distortion. The distortion is detected by monitoring the second harmonic of a digitized sample of the read signal. A running average of the digitized amplitude of the second harmonic is generated by a digital bandpass filter. The root mean square of the running average of the digitized amplitude of the second harmonic is estimated. The estimated RMS value is compared against a reference value indicative of minimum distortion and the difference between the estimated RMS value and the reference value is used to adjust the bias current.

REFERENCES:
patent: 3564160 (1971-02-01), Temes
patent: 3979775 (1976-09-01), Schwarz
patent: 4050086 (1977-09-01), Harr
patent: 4280158 (1981-07-01), de Niet
patent: 4435734 (1984-03-01), Hedberg et al.
patent: 4703378 (1987-10-01), Imakoshi et al.
patent: 4712144 (1987-12-01), Klaassen
patent: 4796106 (1989-01-01), Veillard

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