This paper deals with the modeling of fault for analog circuits. A two-dimensional (2D) fault model is first proposed based on collaborative analysis of supply current and output voltage. This model is a family of circle loci on the complex plane. and it simplifies greatly the algorithms for test point selection and potential fault simulations. https://www.nacrack.com/amazing-offer-Grand-Love-Reposado-Tequila-Red-Glass-Heart-save-extra/