Tessent DefectSim is a transistor-level defect simulator for analog, mixed-signal (AMS), and non-scan digital circuits. It measures defect coverage and defect tolerance and is perfect for both high-volume and high-reliability ICs.
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Tessent DefectSim replaces manual test coverage assessment in AMS circuits, generating objective data to guide improvements needed to meet quality and functional safety standards and test coverage goals.
Tessent DefectSim builds on the transistor-level defect-injection techniques used in TestKompress Cell-Aware ATPG for scannable digital circuits. Tessent DefectSim is suitable for industrial circuit blocks containing hundreds or hundreds of thousands of transistors, and DC, AC, or transient analysis.
Tessent DefectSim generates an executive summary listing likelihood-weighted defect coverage and the confidence interval. The summary also includes a matrix that lists each defect and whether it was detected by a failing test limit or a digital output differing from the defect-free circuit’s output. A second summary reports all ISO 26262 metrics.
Tessent DefectSim uses many techniques to dramatically reduce total simulation time compared to simulating production tests and flat-extracted layout netlists in classic SPICE on parallel CPUs. Reduces total simulation time up to one million times compared to simulating a production test for each possible defect in a flat netlist.
"We evaluated Tessent DefectSim on several automotive ICs and concluded it is a highly-automated and flexible solution that guides improvements in test and design-for-test techniques and allows us to measurably improve the defect coverage of analog tests."
Wim Dobbelaere, Director of test and product engineering, ON Semiconductor
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