A stand-alone integrated excitation/extraction system for analog BIST applications

An integrated test core for mixed-signal circuits is described. The core consists of a completely digital implementation, except for a simple reconstruction filter and a comparator. It is capable of both generating arbitrary band-limited waveforms (for excitation purposes) and coherently digitizing arbitrary periodic analog waveforms (for DSP-based test and measurement). A prototype IC was fabricated in a 0.35 /spl mu/m CMOS process and was demonstrated to perform various curve tracing, oscilloscope, and spectrum analysis tasks.