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:
May. 23, 2017
Filed:
Nov. 25, 2015
Applicant:
Rambus Inc., Sunnyvale, CA (US);
Inventor:
Reza Navid, San Francisco, CA (US);
Assignee:
Rambus Inc., Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H 7/40 (2006.01); H04L 25/49 (2006.01); H04L 25/03 (2006.01);
U.S. Cl.
CPC ...
H04L 25/4917 (2013.01); H04L 25/03343 (2013.01); H04L 2025/03363 (2013.01);
Abstract
A transmit circuit can be configured to output two-level pulse amplitude modulation (PAM-2) or four-level pulse amplitude modulation (PAM-4). In the PAM-2 mode, pre-tap feed-forward equalization (FFE) and post-tap FFE can be applied to the PAM-2 signal by pre-taps and post-taps, respectively. In the PAM-4 mode, at least one post-tap is repurposed to generate, along with the main tap, the main PAM-4 signaling levels. At least one PAM-2 FFE tap is repurposed to apply FFE in the PAM-4 mode.