Publication

Discrete Time Analysis of Phase Detector Linear Range Extension in Sub-Sampling PLL

Yusuf Leblebici, Duygu Kostak
2020
Conference paper
Abstract

The discrete time analysis of the phase detector linear range extension in the first and the second order sub sampling phase-locked loop (SSPLL) is presented. The aim is to understand how much the stability and the pull-in range are affected by the linear range of the sub -sampled phase detector. To change the linear range, sinusoidal, triangular and sawtooth signals are used as the voltage-controlled oscillator (VCO) output signals. The discrete time domain equations of the first and the second order loops are built and solved to determine the stability conditions. The pull-in ranges are examined numerically. The simulations are done in MATLAB, and it is shown that the linear range extension results in an extended pull-in range in both cases, but the initial condition of the loop filter affects the extended pull -in range for the second order loop.

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