I. Introduction
Due to the wide application of analog circuits in military, automatic control, household appliances, communications, and so on, an enhanced technology associated with the fault diagnosis of analog circuit is extremely essential [1]. The immense applications of analog circuits have caused fault diagnosis to become an active area of research. Henceforth, different methods are being developed. However, there are various issues in the fault diagnosis of analog circuits, which have been addressed by the researchers at the chip level and the system board level [2], [3]. Though various automatic fault-testing strategies are being designed for diagnosing the faults in the analog circuits, the development of effective techniques is still an open research area [1]. One main reason is that the process of developing the test strategies for the analog circuit diagnosis heavily relies on the engineer’s experience and intuition. Fault identification in any analog circuit is necessary to ensure its reliability, since the process of fault diagnosis is complicated than in the digital circuits due to nonlinear effects, component tolerance, worst fault models, etc [4]. Moreover, the usage of a larger number of response parameters introduces difficulty in testing, in addition to its cost [2].