Variable reference frequency tracking of second order voltage switched CP-PLL.

Ehsan Ali Buriro; Khuda Bux Amur; Nasreen Ehsan; Ghulam Mustafa Bhutto

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Variable reference frequency tracking of second order voltage switched CP-PLL.

Author(s)

Ehsan Ali Buriro Department of Electronic Engineering, Nawabshah, Sindh, Pakistan

Khuda Bux Amur Department of Mathematics & Statistics, Quaid-e-Awam University of Engineering Science & Technology, Nawabshah, Sindh, Pakistan

Nasreen Ehsan Department of Electronic Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Sindh, Pakistan

Ghulam Mustafa Bhutto Department of Electrical Engineering, Quaid-e-Awam University of Engineering, Science & Technology, Nawabshah, Sindh, Pakistan

Abstract

The charge-pump phase locked loop (CP-PLL) is widely utilized integrated circuit for different applications in communication for frequency generations and tracking. The linear models are not applicable to explore the system dynamics when a variable reference frequency is applied to the system, because of their limited validity in the locked state (i.e. for small phase variations). However the discrete-time non-linear models are advantageous over linear model in characterizing the model behavior when the CP-PLL is initially acquiring the lock on to phase of the reference signal. In this paper, the non-constant reference frequency is applied to both voltage and current switched CP-PLL systems using the event driven technique. The weakly damped dynamics of the voltage switched system limits its performance while tracking the ramping reference frequency due to its varying pumping current characteristics.

Publication Details

Page(s) 29-33

DOI DOI not available

Published Journal: Quaid-e-Awam University Research Journal of Engineering, Science and Technology, Volume: 12, Issue: 2, Year: 2013

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