%0 Journal Article
%T Estima£¿£¿o de frequ¨ºncia usando sensores de erro com atrasos adaptativos
%A Correa
%A Diego Paolo Ferruzzo
%A Bueno
%A ¨¢tila Madureira
%A Piqueira
%A Jos¨¦ Roberto Castilho
%J Sba: Controle & Automa£¿£¿o Sociedade Brasileira de Automatica
%D 2011
%I Sociedade Brasileira de Autom¨¢tica
%R 10.1590/S0103-17592011000400006
%X this paper proposes a solution to improve the performance of the first order early error sensing (ees) adaptive time delay tanlock loops (atdtl) presented in (al-zaabi, al-qutayri e al-araji, 2005), regarding to frequency estimation and tracking time. the ees-atdtl are phaselocked-loops (pll) used to hardware implementations, due to their simple structure. fixed-points theorems are used to determine conditions for rapid convergence of the estimation process and a estimative of the frecuency input is obtained with a gaussian filter that improves the gain adaptation. the mathematical models are the presented by (al-araji, al-qutayri e al-zaabi, 2006). simulations have been performed to evaluate the theoretical results.
%K early error sensing time delay tan-lock loop
%K gaussian filter
%K adaptive gain
%K digital pll
%K synchronism
%K fixed-point theorem.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-17592011000400006&lng=en&nrm=iso&tlng=en