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. 11, 2007
Filed:
Mar. 19, 2004
Jared L. Zerbe, Woodside, CA (US);
Carl W. Werner, Los Gatos, CA (US);
William F. Stonecypher, San Jose, CA (US);
Fred F. Chen, San Francisco, CA (US);
Jared L. Zerbe, Woodside, CA (US);
Carl W. Werner, Los Gatos, CA (US);
William F. Stonecypher, San Jose, CA (US);
Fred F. Chen, San Francisco, CA (US);
Rambus Inc., Los Altos, CA (US);
Abstract
Provided are a method and apparatus for high-speed, multi-mode PAM symbol transmission. A multi-mode PAM output driver drives one or more symbols, the number of levels used in the PAM modulation of the one or more symbols depending on the state of a PAM mode signal. Additionally, the one or more symbols are driven at a symbol rate, the symbol rate selected in accordance with the PAM mode signal so that a data rate of the driven symbols is constant with respect to changes in the state of the PAM mode signal. Further provided are methods for determining the optimal number of PAM levels for symbol transmission and reception in a given physical environment.