Testing and inspection

Which correctly describes BIST (built-in self-test)?

  1. AAll tests are performed by an external tester alone
  2. BTest circuitry is built into the chip so that the chip tests itself
  3. CAppearance is inspected by eye
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Answer: B. Test circuitry is built into the chip so that the chip tests itself

BIST builds pattern-generation and result-checking circuits into the chip so that the chip runs tests itself. It is widely used especially for testing large memories, reducing dependence on expensive external testers and cutting test time.

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More Testing and inspection questions

  1. Which correctly describes a probe card?
  2. Which correctly describes the stuck-at fault model used in testing logic circuits?
  3. Which is the correct definition of fault coverage for test patterns?
  4. What is KGD (Known Good Die), which is important when mounting several chips in one package?
  5. What is the technique called in which a tester measures several chips simultaneously to lower test cost?