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:
Feb. 26, 2002
Filed:
Feb. 29, 2000
Paul H. Ouyang, San Jose, CA (US);
Joseph W. Ku, Palo Alto, CA (US);
Donald Liusie, San Jose, CA (US);
Dmel Inc., Santa Clara, CA (US);
Abstract
A dynamic impedance adjustment circuit that reduces overshoot and undershoot noise while achieving fast slew rates. The dynamic impedance adjustment circuit has an output driver for selectively driving or drawing current providing source or sink current. The dynamic impedance adjustment circuit also has an a variable impedance output driver for selectively providing a dynamic current (source or sink) for a predetermined time after transitions from a logic low level to a logic high level or from a logic high level to a low logic level in the input signal. An impedance adjustment control circuit is coupled to the variable impedance output driver for automatically detecting the transitions in the input signal and for changing the impedance of the variable impedance output driver based on the input signal, enable signal, and the output node.