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:
Sep. 16, 2008
Filed:
Oct. 15, 2004
Stephen D. Anderson, Minnetonka, MN (US);
David E. Tetzlaff, Minnetonka, MN (US);
Michael J. Gaboury, Burnsville, MN (US);
Matthew L. Bibee, Bloomington, MN (US);
Stephen D. Anderson, Minnetonka, MN (US);
David E. Tetzlaff, Minnetonka, MN (US);
Michael J. Gaboury, Burnsville, MN (US);
Matthew L. Bibee, Bloomington, MN (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
Circuitry for equalizing a high data rate serial data stream that receives low frequency and high frequency test tones, accurately measures an amount of attenuation experienced by the high frequency test tone in relation to the low frequency test tone, and accordingly, produces equalization data that results in a corresponding amount of equalization or pre-emphasis being added to an outgoing signal. More specifically, however, the present invention includes both open loop and closed loop systems for equalizing or adding pre-emphasis to a signal with attenuation. In the open loop transceiver system, a presumption is made that an amount of attenuation in both the outgoing and ingoing directions are equal. In the closed loop transceiver system, a receiver determines an amount of equalization and produces the equalization data to a remote transceiver.