Soft fault diagnosis in analog electronic circuits using graphical method

A novel approach towards diagnosis of faulty conditions in linear analog electronic circuits in a probabilistic sense using Markovian tree network is proposed in this write up. The approach is aimed to propose a methodology to arrive at certain conditions to explicitly classify a system in its faulty and non faulty modes. Depending on the parameters linked to the probabilistic approach like failure probability attached to the component and rate of failure function, the availability and unavailability condition of the system is obtained. In contrast to deterministic approach which might provide only specific results under specific operating condition, the probabilistic approach discussed in this paper will fit in for generalized conditions and can be applied to any system irrespective of the complexity involved. The proposed approach is applied to Sallen key Second Order low-pass filter with encouraging results.