Modelling and behavioural simulation of a highspeed phaselocked loop for frequency synthesis.pdf

Published in IET Signal Processing Received on 1st June 2011 Revised on 27th January 2012 doi: 10.1049/iet-spr.2011.0212 ISSN 1751-9675 Modelling and behavioural simulation of a high-speed phase-locked loop for frequency synthesis K. Kalita1 J. Handique 1 T. Bezboruah1,2 1Department of Electronics Communication Technology, Gauhati University, Guwahati 781014, Assam, India 2Multidisciplinary Laboratory, The Abdus Salam International Centre for Theoretical Physics (ICTP), Strada Costiera 11, I – 34151, Trieste, Italy E-mail: tbezboru@ictp.it Abstract: This study proposes the modelling and behavioural simulation of a high-speed phased-locked loop for frequency synthesis. The authors consider the second-order active lag-lead as well as the standard feedback approach of loop filter design for the system model. The s-domain transfer functions of the model for both the cases under considerations are derived for its linear analysis, considering its elemental values. Transient behaviour and stability of the model is analysed using behavioural simulations in MATLAB (Version: 7.1) which shows excellent results. Here, the authors discuss in detail the procedure for mathematical derivation of the theoretical model, taking into account both active lag-lead and standard feedback approach for the loop in the PLL model, the various aspects of methodology for simulations and their results. 1 Introduction many biological oscillators, such as the heart and lungs [1