High speed test structures for in-line process monitoring and model calibration [CMOS applications]
2005
The use of in-line test structures for routinely monitoring various high frequency aspects of the performance of CMOS gates is described. These compact test structures use DC I/Os and are compatible with standard parametric testers. The specific examples described are ring oscillators for a wide range of self-consistent parameter extraction ranging from circuit delays to gate length and leakage components; and a new class of self-timed/calibrated structure of which a circuit for measuring SOI switching history effects, utilizing 100 ps time-scale self-generated pulses, is presented as a representative example.
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