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:
Jan. 05, 1999
Filed:
Sep. 13, 1996
Applicant:
Inventor:
Barry J Arnold, Fort Collins, CO (US);
Assignee:
Hewlett-Packard Company, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
327112 ; 365203 ;
Abstract
A driver circuit for capacitively loaded lines. The driver circuit has both precharge/pull-low and hold-high. The capacitively loaded line is precharged during a precharge phase of a clock signal. The driver circuit is active only during a drive phase of a clock signal. The driver has a hold-up transistor that is sufficiently large to suppress noise coupled into the line during the drive phase, but is substantially smaller than what is required to make pull-up time equal to pull-down time. The driver circuit provides the low noise characteristics of push-pull but with less circuit area and line capacitance than typical push-pull driver circuits.