By Gloria Huertas Sánchez, Diego Vázquez García de la Vega, Adoración Rueda Rueda, Jose Luis Huertas Díaz
Oscillation-Based try out in Mixed-Signal Circuits provides the improvement and experimental validation of the structural attempt technique known as Oscillation-Based try – OBT briefly. the implications the following offered permit to say, not just from a theoretical viewpoint, but additionally in line with a large experimental aid, that OBT is a good defect-oriented attempt answer, complementing the present practical try recommendations for mixed-signal circuits.
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Extra resources for Oscillation-Based Test in Mixed-Signal Circuits
In this range of α , it can be considered than the oscillation frequency is independent of the amplifier gain- bandwidth product, GB . But, it is no advisable when the OBT strategy is applied to an operational amplifier. 6: Error in the nominal frequency frequency expression6. Nevertheless, in this last case, a very accurate operational amplifier model is required in order to obtain a good estimation of the nominal frequency, a critical point because this nominal value must be supposed as the reference value for evaluating the test output.
Providing a mechanism to isolate every BUT. - Providing a (nonlinear) feedback path to convert every BUT in an self-starting and robust oscillator. - Getting a valid and meaningful model for self-sustained oscillations (connected with the BUT design equations)14. - Devising a straightforward method for reading the test outcome from every BUT. - Interpreting the test results for the whole system. These problems might be adequately solved for every specific example. Nevertheless, this thesis pursues to provide some guidelines useful to apply the basic ideas underlying the OBT/OBIST concept to any particular structure.
The work in  discusses the problem of accessing internal nodes and gives some ideas about possible procedures for on-chip decision mechanisms12. 7 The test process As can be seen in the literature -, , -, -, , , -, -, in spite of the fact that some OBT methods have been proposed by several researchers for digital and mixed-signal systems, devising a completely general OBT strategy that can be employed to all the analog and mixed-signal circuits is a task still unfeasible.