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:
Jun. 25, 2013
Filed:
Nov. 22, 2010
Dariush Dabiri, San Jose, CA (US);
Maged F. Barsoum, Saratoga, CA (US);
Dariush Dabiri, San Jose, CA (US);
Maged F. Barsoum, Saratoga, CA (US);
Applied Micro Circuits Corporation, Sunnyvale, CA (US);
Abstract
A circuit and method perform adaptive spectral enhancement at a frequency ω(also called 'fundamental' frequency) on an input signal y which includes electromagnetic interference (EMI) at an unknown frequency, to generate a fundamental-enhanced signal φ(or its complement). The fundamental-enhanced signal φ(or complement) is thereafter used in a notching circuit (also called 'fundamental notching' circuit) to generate a fundamental-notched signal y−φ. The fundamental-notched signal y−φis itself enhanced to generate a harmonic-enhanced signal φthat is used to notch the fundamental-notched signal y−φagain, in one or more additional notching circuits that are connected in series with the fundamental notching circuit. The result (“cascaded-harmonic-notched” signal) is relatively free of EMI noise (fundamental and harmonics), and is used as an error signal for an adaptation circuit that in turn identifies the fundamental frequency ω. Use of a cascaded-harmonic-notched signal as the error signal improves speed of convergence of adaptation.