Experimental Validation of a Fully Digital BISTfor Cascaded Sigma Delta Modulators

This work presents a SigmaDelta modulator prototype that gives experimental support to a fully digital built-in self-test scheme. The goal of the proposed BIST is to provide digital signatures that are directly related to some important behavioural parameters of SigmaDelta modulators. As a result, parametric drifts can be detected before they seriously affect performance. The modulator required modifications are minimal and few gates would be necessary to implement a full BIST version, enabling infield self-test