A Step Response Based Mixed-Signal BIST Approach for Continuous-time Linear Circuits

A new Mixed-Signal Built-in self-test approach that is based upon the step response of a reconfigurable (or multifunction) analog block is presented in this paper. The technique requires the overlapping step response of the Circuit Under Test (CUT) for two circuit configurations. Each configuration can be realized by changing the topology of the CUTor by sampling two CUTnodes with dsffering step responses. The technique can effectiveIy detect both soft and hardfaults anddoes not require an analog-to-digital converter (ADC) andor digital-to-analog converter( DAC). It also does not require any precision voltage sources or comparators. This approach does not require any additional analog circuits to realize the test signal generator and sample circuits. The paper is concluded with the application of the proposed approach to a circuit found in the w r k of Epstein et al [ I ] and two ITC’97 analog benchmark circuits.