Time-varying signals in power systems require a real- time processing in many applications such as control, protection, and monitoring. Traditional methods based on Fast Fourier Transform (FFT) may lose accuracy in non-stationary conditions. This book is based on a research conducted in Florida State University. In this book the authors provides an alternative method derived from Amplitude Demodulation for real time tracking of time-varying power system signals. It is also shown in this book how an Amplitude Demodulation circuit has been implemented, simplified, and optimized on Field...