Estudo das características de distorção não linear de intermodulação de desmoduladores de FM por PLL

Abstract

The nonlinear distortion of a PLL frequency discriminator is addressed using the Volterra Series approach. The analysis, made entirely in the frequency domain, allows distortion calculations for periodic and nonperiodic sets of discrete excitation frequencies (harmonic and intermodulation distortion up to 3rd order) and random inputs. It also includes, simultaneously, the two major sources of distortion in a PLL: Phase Detector and VCO. In addiction a method for reduction of non-linear distortionis investigated.