Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Reexamination Certificate
2006-03-28
2006-03-28
Faber, Alan T. (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
C360S068000, C330S252000, C327S110000
Reexamination Certificate
active
07019923
ABSTRACT:
A pre-amplifier, a Thevenin writer and a disk drive employing transistors having a breakdown voltage below a circuitry operating voltage. In one embodiment, the pre-amplifier includes an emitter-follower transistor pair couplable to a power supply and a differential transistor pair, having a collector-emitter breakdown voltage below a voltage of the power supply, that receives current from, and controlled by, the emitter-follower transistor pair.
REFERENCES:
patent: 3497824 (1970-02-01), Goordman
patent: 6388476 (2002-05-01), Isobe et al.
patent: 6512646 (2003-01-01), Leighton et al.
patent: 6525896 (2003-02-01), Chung et al.
“Influence of Impact-Ionization-Induced Instabilities on the Maximum Usable Output Voltage of Si-Bipolar Transistors” by Matthias Rickelt, et al.; IEEE Transactions on Electronic Devices; vol. 48, No. 4; Apr. 2001; pp. 774-783.
Fang Hao
Leighton John D.
O'Brien Michael J.
O'Brien Scott
Rabe Cameron C.
Agere Systems Inc.
Faber Alan T.
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