Oscillation based analog testing — A case study

The Oscillation Based Testing (OBT) method represents an effective and simple solution to the testing problem of discrete continuous time analog electronic filters. Its implementation, however, still imposes need for knowledge of the circuit under test (CUT) behaviour and the simulation algorithms of oscillators in the time domain. In this paper we describe the implementation of the OBT method to a second order notch cell realized with one operational amplifier. For simulation we used LTspice. A realistic model for simulation of the operational amplifier in time domain was used. The results obtained confirm the hypothesis of usefulness of OBT. Single soft and catastrophic faults are considered with more detail while double soft faults are exemplified only. Ideas for future work are suggested.