Estima？？o de frequência usando sensores de erro com atrasos adaptativos

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.