Testing and inspection

Which technique models defects such as transistor shorts and opens inside standard cells based on each cell's circuit and generates test patterns for them?

  1. AVisual inspection
  2. BCell-aware test
  3. CIDDQ test only
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Answer: B. Cell-aware test

Traditional fault models such as stuck-at focus only on cell input and output pins. Cell-aware test simulates transistor-level defects inside cells and generates patterns to detect them. It helps reduce field failures from intra-cell defects, which have increased in fine processes.

  • A. Visual inspection cannot find internal electrical defects.
  • B. Correct. It models defects inside cells.
  • C. IDDQ detects defects through supply current but is separate from modeling intra-cell defects.
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  1. Which correctly describes wafer test (probe test)?
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  4. Which items are mainly checked in a semiconductor DC test?
  5. Which correctly describes BIST (built-in self-test)?