Electronic Test process is vital during system design and development as well as during service to maintain the system functioning. Test methodologies are broadly categorized as analog, digital and mixed signal based on the nature of a system. Implementing a test method for analog circuits is still a challenging task because of nonexistence of well developed techniques and the growing complexity level of circuits. This book on Fault Diagnosis of Linear and Nonlinear Analog Circuits helps the readers or researchers to have good understanding of the fundamental concepts behind analog circuit testing. It covers fault diagnosis of both linear and nonlinear analog circuits. It guides the reader about the challenges in testing, fault models and classification of fault diagnosis methods. It presents the state of the art in fault diagnosis of both linear & nonlinear analog circuits and experimental results of some of the fault diagnosis methods.