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:
Jul. 09, 2002
Filed:
Aug. 16, 2000
Maria R. Tursi, Munich, DE;
Robert C. Taft, Munich, DE;
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
An output driver includes an adjustable main output stage and a control circuit with a digital delay locked loop (digital DLL) circuit and an adjustable scaled output stage. The main output stage and the scaled output stage are both configured to adjust their strengths in response to a control signal generated by the control circuit. The control circuit receives a clock signal and propagates a transition through the scaled output stage. The DLL circuit compares the propagation time through the scaled output stage with a reference signal (that is dependent on the clock signal frequency) and generates the control signal as a function of comparison. The main output stage, receiving the same control signal, adjusts its strength in a corresponding manner.