Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of the amplifier
Reexamination Certificate
2005-04-19
2005-04-19
Faber, Alan T. (Department: 2651)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of the amplifier
Reexamination Certificate
active
06882491
ABSTRACT:
A dual mode write driver, such as in a tape or disk drive system, provides both a voltage mode of operation and a current mode of operation by combining the required topology in a write driver circuit. A logic control signal applied to an input to the dual mode write driver causes the circuit to configure for either mode. The write driver has a first PFET (P3) coupled to a first NFET (N1) at a first node connected through a resistor (R1) to a first side of a write head (L1) of the write driver, and a second PFET (P4) coupled to a second NFET (N2) at a second node connected through a resistor (R2) to a second side of the write head. A first voltage mode NFET device is turned on during the voltage mode to connect the sources of the first and second NFET devices to ground.
REFERENCES:
patent: 6236246 (2001-05-01), Leighton et al.
patent: 6252450 (2001-06-01), Patti et al.
patent: 6271977 (2001-08-01), Chung et al.
patent: 6307699 (2001-10-01), Patti et al.
patent: 6324028 (2001-11-01), Ramalho et al.
patent: 6735030 (2004-05-01), Ngo et al.
Barkley Jean M.
Faber Alan T.
Scully Scott Murphy & Presser
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