Performance Analysis of the 2^nd Order Phase Lock Loop when Phase Modulation is Added to the Voltage Controlled Oscillator

Abstract

A classic phase lock loop (PLL) consists of a voltage controlled oscillator (VCO), a phase detector (PD) or phase comparator and a loop filter. The characteristics of a PLL are well established. A modification is introduced in the VCO in the name of phase modulation input along with its original frequency modulation input. This paper analyzes the characteristics such as damping factor, relative stability, noise bandwidth, transient behavior in this modified version of 2nd order PLL and compares them with the classic PLL.

Keywords:

• Modified voltage controlled oscillator
• Phase lock loop
• Phase margin of phase lock loop
• Phase modulation
• Phase lock loop damping
• Stability of a phase lock loop

Additional information

Notes on contributors

Basab Chatterjee

Basab Chatterjee is an Assistant Professor, Department of Applied Electronics and Instrumentation Engineering, Academy of Technology, Adisaptagram, Hooghly, West Bengal. He has a B.Tech degree from Calcutta University and M.Tech degree from the same university. He has more than five years of teaching experience. He has contributed research papers to national and international conferences and journals. His areas of interest are Electronic Circuits, Communication and Signal Processing. E-mail: [email protected]

B. N. Biswas

B. N. Biswas, Chairman, Education Division, SKF Group of Institution, Mankundu, Hooghly 712139 (www.skf.edu.in). Former National Lecturer (UGC), Emeritus Fellow (AICTE). Visiting Faculty University of Minnesota (USA); Founder Prof-in-Charge UIT, Microwave Division (BU). CU Gold Medallist; URSI Member: Commissions C, D, E and Developing Countries, Seminar Lecture tour to various universities and institutes in USA, UK, Europe, China, Japan, Thailand, Singapore, etc. E-mail: [email protected]