A High Frequency Software Phase-locked Loop for Frequency Synthesis with 2nd Order Lag-lead Filter in the Loop

摘要

This paper proposes a software model of high speed phase-locked loop (PLL) for frequency synthesis with 2nd order active lag-lead filter (ALLF) in the loop. The transient behavior and stability of the model is analyzed using behavioral simulations in MATLAB which shows excellent results. Here we will discuss in details the procedure for mathematical derivation of the PLL model, various aspects of its simulations and their results.