The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 2006
Filed:
Apr. 22, 2003
John D. Leighton, Anoka, MN (US);
Hao Fang, Savage, MN (US);
Michael J. O'brien, St. Paul, MN (US);
Scott O'brien, Eagan, MN (US);
Cameron C. Rabe, Inver Grove Heights, MN (US);
John D. Leighton, Anoka, MN (US);
Hao Fang, Savage, MN (US);
Michael J. O'Brien, St. Paul, MN (US);
Scott O'Brien, Eagan, MN (US);
Cameron C. Rabe, Inver Grove Heights, MN (US);
Agere Systems Inc., Allentown, PA (US);
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.