On the Performance of Conventional Charge Pump PLLs Incorporating Different kinds of Nonlinear Amplifiers

Abstract

The effect of inclusion of different types of nonlinear amplifier (NLA) in the structure of a conventional charge pump phase locked loop (CP-PLL) has been studied. Through numerical simulation it has been shown that a particular class of NLA (cubic type nonlinearity) improves the acquisition performance of the CP-PLL whereas another class of NLA (limiter type nonlinearity) improves the tracking performance of the said system. The enhancement of acquisition performance of the NLA based CP-PLL has been examined by a prototype hardware experiment.

Indexing terms:

• Charge pump PLL
• Nonlinear amplifier
• Cubic nonlinearity
• Limiter type nonlinearity
• Acquisition and tracking response

Additional information

Notes on contributors

B C Sarkar

B C Sarkar, was born in February 1954 in India. He obtained his BSc (Hons), MSc and PhD degrees in Physics, all from the University of Burdwan, India, in the years 1973, 1975 and 1985 respectively. He joined the post-graduate faculty of Physics, the University of Burdwan, in the year 1980 as a lecturer and subsequently became a Reader in the same Department in the year 1987. Along with his teaching assignments, Dr Sarkar is actively engaged in research in the field of Synchronous Communication Systems, Non-linear Oscillations, Digital Signal Processing etc. He is supervising research work of his students for their Ph D degrees. He has acted as a reviewer of the technical papers submitted to the transaction of IEEE (USA), IEE (UK), IJE (UK). He has published more than 45 papers in different inland and foreign journals and contributed to different national and international symposia.

B De

B De, was born on 25th November 1971 in West Bengal, India. He did his BSc (Hons), MSc (Physics) and MPhil (Microwaves) degrees, all from the University of Burdwan, in the years 1991, 1993, 1995 respectively. He worked as a junior research fellow in the University of Burdwan for nearly one year and joined West Bengal Educational Service in the year 1996. Presently he is working as a lecturer in Physics in the Darjeeling Government College, Darjeeling. His research interests center around field of synchronous communication systems. He has published about five technical papers in inland and foreign journals.