Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Reexamination Certificate
2005-04-12
2005-04-12
Tran, Sinh (Department: 2651)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
C360S067000, C360S053000, C360S046000
Reexamination Certificate
active
06879456
ABSTRACT:
A write driver circuit selectively provides a write current through a write head in first and second opposite directions. The write driver circuit is connected to the write head through an interconnect. The write driver circuit provides an incident write current signal through the interconnect to the write head, and also provides a reflection cancellation signal through the interconnect to the write head. In an exemplary embodiment, the incident write current signal is provided by providing an incident voltage signal across the write head, and the reflection cancellation signal is provided by providing a reflection cancellation voltage signal across the write head. In an exemplary embodiment, the reflection cancellation signal is a delayed and filtered version of the incident write current signal that cancels a reflected signal that is reflected at the interface between the interconnect and the write head due to impedance mismatching.
REFERENCES:
patent: 6121800 (2000-09-01), Leighton et al.
patent: 6222695 (2001-04-01), Canario
patent: 6256161 (2001-07-01), Leighton et al.
patent: 6512646 (2003-01-01), Leighton et al.
patent: 6549353 (2003-04-01), Teterud
Elliott Carl F.
Krenz Nameeta
Leighton John D.
O'Brien Michael J.
O'Brien Scott M.
Agere Systems Inc.
Figueroa Natalia
Kinney & Lange , P.A.
Tran Sinh
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