Low power preamplifier writer architecture

Details Low power preamplifier writer architecture Low power preamplifier writer architecture

2005-12-28

2008-08-05

Ip, Paul (Department: 2837)

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

C318S294000, C318S560000, C318S561000, C360S046000, C360S068000, C327S110000

Reexamination Certificate

active

07408313

ABSTRACT:
A circuit is adapted to activate a writer head of a data storage media drive during both the boost periods as well as the steady state periods. The current supplied to the writer head during the boost periods exceeds the steady state current and flows between positive and negative voltage supplies so as to provide the required magnetic flux change in the inductor disposed in the write head. During the steady state periods, a switch circuit is turned on to provide a second current path across the writer head. During the steady state periods, the current flows between the positive voltage supply and the ground to reduce power consumption. The switch circuit is turned off during the boost periods.

REFERENCES:
patent: 5869988 (1999-02-01), Jusuf et al.
patent: 5894237 (1999-04-01), Brannon et al.
patent: 5986832 (1999-11-01), Barnett
patent: 6121800 (2000-09-01), Leighton et al.
patent: 6252440 (2001-06-01), Sushihara et al.
patent: 6285221 (2001-09-01), Leighton et al.
patent: 6404574 (2002-06-01), Barnett
patent: 7068450 (2006-06-01), Ngo et al.
patent: 2004/0120065 (2004-06-01), Takeuchi

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