Testing and inspection

In testing, what is the set of sequences of 0 and 1 signals applied to a chip's inputs, together with the expected responses, called?

  1. ARecipe
  2. BTest patterns (test vectors)
  3. CPhotomask
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Answer: B. Test patterns (test vectors)

Test patterns (test vectors) specify the signal values applied to the chip inputs at each time step and the output values expected in response. Patterns that detect faults efficiently are created by methods such as automatic test pattern generation (ATPG).

  • A. A recipe is the set of process conditions for manufacturing equipment.
  • B. Correct. They pair input sequences with expected values.
  • C. A photomask is the master for transferring patterns by exposure.
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More Testing and inspection questions

  1. What are the dedicated patterns called, placed between chips on the wafer (in scribe lines) and elsewhere, used to measure characteristics of transistors, resistors and the like to evaluate the process?
  2. What is the inspection called that measures TEG parameters such as threshold voltage and sheet resistance on wafers that have completed front-end processing, to confirm the process met specifications?
  3. In test fixtures connecting the tester and IC, which component uses thin spring-loaded pins to make reliable contact with terminals?
  4. What is the printed circuit board called that attaches to the tester's test head, carries the IC socket and peripheral components and routes signals to the IC for each product?
  5. What is the main advantage of vertical probe cards, which stand the needles perpendicular to the pads?