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:
Dec. 07, 1999
Filed:
Apr. 13, 1998
Paul D Wohlfarth, Vernonia, OR (US);
Robert R Hale, Beaverton, OR (US);
Bryan J Dinteman, Canby, OR (US);
Credence Systems Corporation, Fremont, CA (US);
Abstract
A differential driver includes an input stage and an output stage. The input stage receives a differential INPUT signal to produce a differential DRIVE signal of state determined by the INPUT signal. The output stage receives the DRIVE signal and produces a differential OUTPUT signal of state determined by the DRIVE signal. The OUTPUT signal voltage can be adjusted within any of multiple ranges. The output stage adjusts its output load resistance for each OUTPUT signal voltage range in order to maximize operating speed while limiting power consumption in each range. The input stage automatically reduces the voltage of the DRIVE signal input to the output stage for low OUTPUT signal voltages to reduce noise in the OUTPUT signal.