Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2008-05-20
2008-05-20
Nguyen, Hoa Thi (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
C360S065000, C360S067000, C360S068000
Reexamination Certificate
active
10824096
ABSTRACT:
A write driver for driving a write current through a write head connected to the write head by an interconnect or flexible transmission line. The write driver includes a circuit matching an output impedance of the write driver to the odd characteristic impedance of the interconnect and includes a current source generating a current output to the write head. The write driver provides a current amplification effect as the output current is half the write current driven through the write coil. The impedance matching circuit includes an output resistor with a resistance equal to the odd characteristic impedance of the interconnect. The write driver includes a voltage source that operates to maintain a voltage drop of zero on the output resistor during the initial period of twice the transmission delay of the interconnect.
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Alini Roberto
Posat Baris
Venca Alessandro
Jorgenson Lisa K.
Kubida William J.
Mercedes Dismery
Nguyen Hoa Thi
STMicroelectronics Inc.
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