Testing and inspection

In testing, what is it called to set pass/fail limits slightly tighter than the product specification to allow for measurement error and drift over time?

  1. ABinning
  2. BTest compression
  3. CGuard band
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Answer: C. Guard band

Testers have measurement error, and product characteristics change gradually during use. To avoid passing products right at the specification limit, test limits are set with a margin tighter than the specification. This margin is called a guard band. If it is too wide, good parts are also failed and yield drops.

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More Testing and inspection questions

  1. In developing test programs, which is emphasized to lower test cost?
  2. Which method is now common for passing information on chips judged defective in wafer test to the later assembly process?
  3. For automotive semiconductors, what is the main reason for testing not only at room temperature but also at high and low temperatures?
  4. In memory testing, which test pattern repeats writing and reading 0s and 1s while stepping through addresses in order, detecting defects such as interference between adjacent cells?
  5. Which correctly describes ATE (automatic test equipment)?