公开(公告)号：US08964890B2

公开(公告)日：2015-02-24

申请号：US13910779

申请日：2013-06-05

Applicant: Applied Micro Circuits Corporation

Inventor： Dariush Dabiri ,  Maged F. Barsoum

IPC: H04K1/02 ,  H03H21/00

CPC classification number: H03H21/0021 ,  H03H21/0012

Abstract: A circuit and method perform adaptive spectral enhancement at a frequency ω1 (also called “fundamental” frequency) on an input signal y which includes electromagnetic interference (EMI) at an unknown frequency, to generate a fundamental-enhanced signal φ1 (or its complement). The fundamental-enhanced signal φ1 (or complement) is thereafter used in a notching circuit (also called “fundamental notching” circuit) to generate a fundamental-notched signal y-φ1. The fundamental-notched signal y-φ1is itself enhanced to generate a harmonic-enhanced signal φ2 that is used to notch the fundamental-notched signal y-φ1again, 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 ω1. Use of a cascaded-harmonic-notched signal as the error signal improves speed of convergence of adaptation.

Abstract translation: 电路和方法在包括未知频率的电磁干扰（EMI）的输入信号y上对频率ω1（也称为“基本”频率）执行自适应频谱增强，以产生基本增强信号＆phgr; 1（或其 补充）。 1，然后在切口电路（也称为“基本陷波”电路）中使用基本增强的信号＆amp; 1（或补码）以产生基本缺口信号y-＆phgr; 1。 基本缺陷信号y-＆phgr; 1本身被增强以产生用于在串联连接的一个或多个附加凹口电路中陷入基本缺陷信号y-＆phgr; 1again的谐波增强信号＆ph2; 与基本的开槽电路。 结果（“级联谐波陷波”信号）相对没有EMI噪声（基波和谐波），并被用作自适应电路的误差信号，自适应电路进而识别基频ω1。 使用级联谐波陷波信号作为误差信号提高适应性收敛速度。