Peak detection circuit for suppressing magnetoresistive thermal

Details Peak detection circuit for suppressing magnetoresistive thermal Peak detection circuit for suppressing magnetoresistive thermal

1995-12-04

1996-09-24

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform amplitude control

327560, H03K 502

Patent

active

055594603

ABSTRACT:
A peak detector for extracting pulses in a magnetoresistive sensor circuit while suppressing the recovery transients created by thermal asperities. The disclosed peak detector circuit is a simplified variation of the standard magnetoresistive sensor peak detector circuit. The signal differentiation is performed ahead of the usual amplification to remove transient pulse amplitudes before they can affect the AGC gain. The resulting differentiated signal is processed by a modified amplitude qualification circuit to extract data output pulses. The thermal asperity transient recovery period is eliminated without additional circuit complexity, leaving only the initial thermal asperity pulse effects to be corrected by any suitable relatively simple error correction code (ECC).

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P. W. Chung et al., "Prefiltering in the Design of Peristalic Envelope Detectors", IBM Technical Disclosure Bulletin, vol. 33, No. 10B, Mar. 1991, pp. 48-52.

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