Hard (open and short) faults and discrete parameter faults (DPF) are the mostly used fault models in simulation-before-test (SBT) method. Because that the parameter of analog element is continuous. the DPF can not elaborately characterize all possible continuous parameter faults (CPF) occurring in analog circuit. let alone the double soft fault. https://parisnaturalfoodes.shop/product-category/magnesium-liquid/