Embedded multi-detect ATPG and Its Effect on the Detection of Unmodeled Defects

Abstract

The demand for higher quality requires more effective testing to filter out the bad devices. It is already known that multi-detection of single stuck-at faults results in more fortuitous detections of defects not behaving as stuck-at faults, which increases the test quality. Existing multi-detect tests, i.e., the well-known n-detect tests, suffer from significant test size increases. This paper shows that embedding multi-detection of faults within regular ATPG patterns results in a higher quality without a significant increase in test set size. High-volume silicon measurement results demonstrate that embedded multi-detect tests detect 2.3% to 4.7% more defective devices than conventional single-detect stuck-at tests.