Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2005-09-13
2008-12-09
Benson, Walter (Department: 2837)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S067000, C360S078040, C318S034000, C318S254100
Reexamination Certificate
active
07463443
ABSTRACT:
A reduced hardware control circuit device includes a current loop for broad band Hard Disk Drive applications. The current loop detects the value of the current flowing on the coils of a voice coil electric motor incorporated in the Hard Disk Drive. A sensing resistance is connected in series with the motor and at least a driving driver for a relative motor coil. Advantageously the current loop is a transconductance loop with a first transconductance amplifier associated with the sensing resistance. A second transconductance amplifier is provided for fixing the current value to be applied to the motor. The circuit device advantageously is deprived of a local compensation in correspondence with the first transconductance amplifier.
REFERENCES:
patent: 4786993 (1988-11-01), Jove et al.
patent: 4885517 (1989-12-01), Pennock
patent: 5191297 (1993-03-01), Penman et al.
patent: 5412309 (1995-05-01), Ueunten
patent: 5426545 (1995-06-01), Sidman et al.
patent: 5463603 (1995-10-01), Petersen
patent: 5530399 (1996-06-01), Chambers et al.
patent: 5648738 (1997-07-01), Welland et al.
patent: 5789973 (1998-08-01), Barrett et al.
patent: 5859518 (1999-01-01), Vitunic
patent: 6023143 (2000-02-01), Salina et al.
patent: 6072339 (2000-06-01), Bertolini
patent: 6084378 (2000-07-01), Carobolante
patent: 6154340 (2000-11-01), Cameron
patent: 6420910 (2002-07-01), Contreras et al.
patent: 6445530 (2002-09-01), Baker
patent: 6479954 (2002-11-01), Peritore et al.
patent: 6850378 (2005-02-01), Conteras et al.
patent: 6965488 (2005-11-01), Bennett
patent: 7250746 (2007-07-01), Oswald et al.
patent: 7327103 (2008-02-01), El-Sadi
patent: 7339760 (2008-03-01), Gleason et al.
patent: 2002/0001153 (2002-01-01), Maiocchi
patent: 2003/0102851 (2003-06-01), Stanescu et al.
patent: 2003/0210091 (2003-11-01), Kuo
patent: 0 915 346 (1999-05-01), None
patent: 1 339 163 (2003-08-01), None
European Search Report, EO 04 425719, dated May 13, 2005.
Benson Walter
Gardere Wynne & Sewell LLP
Paul Antony M
STMicroelectronics S.r.l.
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