Dr. Aparna Gale (Mujbaile) is an Assistant Professor at Wainganga College of Engineering and Management, Nagpur, with over 18 years of teaching and research experience in the field of Electronics and Communication Engineering. She holds an M.Tech in Electronics, an M.B.A., and a Ph.D. in Electronics. Dr. Aparna Gale specializes in Electronics Engineering and has consistently contributed to academic excellence through her deep understanding of signal processing, system analysis, and engineering education. Her teaching approach emphasizes clarity, practical applications, and student-centric learning. She has mentored numerous students at undergraduate and postgraduate levels and has actively participated in curriculum development and technical training initiatives. This book is a result of her dedication to making complex topics in Electronics Device and Circuit accessible and engaging for students, educators, and professionals alike.