Implementation of High-Dynamic Phase-Locked Loop Based on DSP

Abstract

This paper introduces the basic structure of the ordinary phase-locked loop and analyzes the implementation of phase detector, loop filter and voltage-controlled oscillator. The system function of PLL loop filter shows that the performance of loop filter essentially determines the quality of phase-locked loop. Therefore, this article focuses on the design of loop filter, combined with the application of phase-locked loop in high dynamic GPS receiver, puts forward the realization of a 2-assisted 3-locked loop PLL digital filter in high-dynamic environment in detail, and gives algorithm codes written by C language based on DSP. The simulation results show that the performance of this phase-locked loop PLL has greatly improved than the ordinary, and fully meets the requirements of high dynamic signal tracking.