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:
Aug. 17, 2010
Filed:
Jan. 27, 2005
Nicolas Nodenot, Mountain View, CA (US);
Laurence D. Lewicki, Menlo Park, CA (US);
Nicolas Nodenot, Mountain View, CA (US);
Laurence D. Lewicki, Menlo Park, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A system and a method are disclosed for providing a parameterized analog feedback loop for continuous time adaptive equalization that incorporates low frequency attenuation gain compensation. N adaptive equalizer stages are coupled in series and a slicer circuit is coupled to the last (Nth) adaptive equalizer stage. A single equalizer adaptation control loop controls the frequency response of the adaptive equalizer stages to compensate for the attenuation of a lossy channel. The single equalizer adaptation control loop also compensates for the direct current (DC) loss in the lossy channel by modulating a bias current in the slicer circuit to scale the low frequency feedback with adaptation coefficients that correlate with channel length.