NAIR, B. SOMANATHAN B. SOMANATHAN NAIR, is Visiting Professor, Department of Optoelectro-nics and Optical Communication, University of Kerala, Thiruvananthapuram. Earlier, he was Joint Director, Directorate of Technical Education, Government of Kerala, Trivandrum, and Controller of Examinations, Kannur University, Kerala. Besides, he had been Professor and Head of Department of Electronics in various engineering colleges of Kerala; he also had a stint as Visiting Faculty at the Department of Electrical Engineering, University of Idaho, USA. A member of IEEE (USA) and life member of ISTE (India), Professor Nair has authored three books on Electronics. DEEPA, S. R. S. R. DEEPA is Professor and Head, Department of Electronics and Communication Engineering, Pankaja Kasthuri College of Engineering and Technology, Thiruvananthapuram, and Visiting Professor, Department of Optoelectronics, University of Kerala. She has over 26 years of teaching experience and is the author of a number of textbooks in Electronics and Communication Engineering.