Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2005-03-15
2005-03-15
Faber, Alan T. (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
C360S068000, C360S066000
Reexamination Certificate
active
06867936
ABSTRACT:
A magnetic head driving circuit includes a main driving circuit symmetrical with respect to a centered recording coil, and at least two pairs of adding circuits, each pair including a positive pulse adding circuit and a negative pulse superposed circuit symmetrical with respect to the centered coil. And, by reversing the direction of the magnetic head coil current, at least one of the adding circuits is made to operate and make it as a magnetic head driving circuit for adding a potential equal to or higher than the power supply, thereby to drive as a sub-driving circuit arranged symmetrically with respect to the centered coil, which promotes the reversal of the magnetic head coil current, and which drives stably with a central potential of the coil at about the disk potential.
REFERENCES:
patent: 5282094 (1994-01-01), Ngo
patent: 6614273 (2003-09-01), Teterud et al.
Steven Lam, Lawrence Cheng and David Young, “A 550Mb/s GMR Read/Write Amplifier Using 0.5 μm 5V CMOS Process” 2000 IEEE International Solid-State Circuits Conference, Feb. 9, 2000, pp. 358-359 and 470-471.
Kobayashi Yoichiro
Maio Kenji
Ookuma Yasuyuki
Yoshizawa Hiroyasu
A. Marquez, Esq. Juan Carlos
Faber Alan T.
Fisher Esq. Stanley P.
Hitachi , Ltd.
Reed Smith LLP
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