Novel nonlinear fast locking PLLs based on mathematical models

In this paper, a new structural for phase locked loop based on adding a non linear element is introduced. The proposed PLL, denoted by NPLL, is similar to the standard PLL except that it incorporates a nonlinear element in its loop. The proposed NPLL enhancements speed and stability of system by adjusting direct gain. Assess the performance of the proposed structure, various tests performed and results compared standard phase locked loop. Many tests, results of several of which are reported in this paper, show the superior performance of the NPLL.