4.4.4. Improved Fault Coverage

Try these first

1. 1.

   What is meant by 'fault coverage' in BIST?

   Hint

   Think about how many faults can be identified during testing.

2. 2.

   Name one type of fault that BIST can detect.

   Hint

   Consider faults that keep a signal static.

3. 3.

   What does a high fault coverage indicate?

   • Low reliability
   • High reliability
   • No impact on reliability

   Hint

   Think about the relationship between testing and system robustness.

4. 4.

   True or False: Stuck-at faults can be detected by BIST.

   • True
   • False

   Hint

   Recall the definitions discussed earlier.

5. 5.

   Consider an electronic system that implements BIST. If the fault coverage is reported at 85%, what does this suggest about the number of detectable faults?

   Hint

   Think about what a percentage represents in terms of whole system faults.

6. 6.

   Analyze why BIST may have limitations regarding unknown or complex faults. Provide a real-world example where this could be critical.

   Hint

   Consider scenarios where new technologies might introduce unforeseen faults.