Weighted average servo burst peak detector for disk drive read

Details Weighted average servo burst peak detector for disk drive read Weighted average servo burst peak detector for disk drive read

1993-09-10

1994-11-08

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 58, 327 91, G11C 2702, H03K 5159

Patent

active

053629930

ABSTRACT:
A peak detector samples and holds amplitudes of pulses of a servo burst and includes a master peak detector for following a portion of a rising edge of each pulse until a peak amplitude is reached, and for decaying rapidly at a falling edge of each burst following the peak until a rising edge of a subsequent burst is intercepted at a point of interception, and for generating a control window extending from the point of interception of a rising edge to a peak value of each subsequent pulse; a slave peak detector enabled by the control window of the master detector for following the portion of the rising edge of each burst from the point of interception to the peak value, and for holding the peak value reached by the master detector during the control window, a holding circuit responsive to the slave detector and having a first, rapid time constant for rapidly acquiring a peak value of at least one initial peak of the burst, and having a second, slower time constant for adjusting the initially acquired peak value in light of subsequent peak values of the burst; and, a switching circuit for automatically switching the holding circuit from the first time constant to the second time constant.

REFERENCES:
patent: 4031479 (1977-06-01), Thomas, Jr. et al.
patent: 4477849 (1984-10-01), Berger
patent: 4533844 (1985-08-01), Miller et al.
patent: 4669004 (1987-05-01), Moon et al.
patent: 4698523 (1987-10-01), Gershon et al.
patent: 4868470 (1989-09-01), Bucska et al.
Att Data Sheet, ATT91C010 Low-Power Reach1 Device, Apr. 1991, 23 pages (pp. 1-23).

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