Ultra low cost analog BIST using spectral analysis

In this work, a low cost method to implement an analog BIST scheme for the system on chip environment is presented. The method is based on spectral analysis and it is entirely digital. A simple and low cost 1-bit digitizer is used to capture analog information without the need for an AD converter or oversampling techniques. It also allows partitioning of the analog circuit for test thanks to the low analog area overhead of the digitizer. The mathematical framework and a test example are presented, with practical results illustrating limitations and advantages of the proposed technique.