A current integrator for BIST of mixed-signal ICs

TitleA current integrator for BIST of mixed-signal ICs
Publication TypeConference Paper
Year of Publication1999
AuthorsTabatabaei, S., and A. Ivanov
Conference NameVLSI Test Symposium, 1999. Proceedings. 17th IEEE
Pagination311 -318
Keywords0.5 micron, 72 pF, average supply current, BIST, built-in current integrator, built-in self test, circuit optimisation, circuit performance trade-off, CMOS integrated circuits, CMOS technology, comparator, current signature generator, digital signature, embedded circuit blocks, integrating circuits, mixed analogue-digital integrated circuits, mixed-signal ICs, optimization guidelines, power monitor

A novel built-in current integrator (BICI) is proposed for measuring the average supply current (IDD) of embedded circuit blocks. Such a circuit can be used both as a current signature generator and power monitor. The BICI uses only small capacitors (total 72 pF), a simple comparator, 7 switches, and a counter to perform integration over a long time (1 ms) window and digitize IDD. The BICI generates a digital signature proportional to IDD and occupies a small area which make it suitable for BIST applications on mixed-signal ICs. The circuit has been implemented using a standard 0.5 mu; CMOS technology. Circuit performance trade-offs are analyzed and optimization guidelines provided. Simulation results are also included


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