A current integrator for BIST of mixed-signal ICs

A novel built-in current integrator (BICI) is proposed for measuring the average supply current (I/sub DD/) 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 I/sub DD/. The BICI generates a digital signature proportional to I/sub DD/ 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 /spl mu/ CMOS technology. Circuit performance trade-offs are analyzed and optimization guidelines provided. Simulation results are also included.

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