Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-05-31
2005-05-31
Sniezek, Andrew L. (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S075000
Reexamination Certificate
active
06900959
ABSTRACT:
A disk drive is disclosed employing an offset-nulling amplifier for detecting a back EMF voltage of a voice coil motor (VCM) in a velocity mode servo control system. The offset-nulling amplifier comprises a differential amplifier, an input stage for swapping the polarity of the input voltage at a periodic interval, and an output stage comprising a single-ended amplifier having an input switched at the periodic interval between the positive and negative outputs of the differential amplifier.
REFERENCES:
patent: 5844743 (1998-12-01), Funches
patent: 6081112 (2000-06-01), Carobolante et al.
patent: 6097564 (2000-08-01), Hunter
patent: 6262626 (2001-07-01), Bakker et al.
Gardner Norman D.
Ryan Robert P.
Shara, Esq. Milad G.
Sheerin, Esq. Howard H.
Slavitt Mitchell
Sniezek Andrew L.
Western Digital Technologies Inc.
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