Miljana Milic, Vančo Litovski

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Testing switched capacitor circuits is a challenge due to the diversity of the possible faults. A special problem encountered is the synthesis of the test signal that will control and will make the fault-effect observable at the test point. The oscillation based method which was adopted for testing in these proceedings resolves that important issue by his nature. Here we discuss the properties of the method and the conditions to be fulfilled in order to implement it in the right way. To achieve that we resolved the problem of synthesis of the positive feed-back circuit and the choice of a proper model of the operational amplifier. In that way a realistic foundation to the testing process was generated. A second order notch cell was chosen as a case-study. Fault dictionaries were developed related to the catastrophic faults of the switches used within the cell. The results reported here are a continuation of our previous work and are complimentary to some other already published.

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