â€“ A transistor becomes permanently nonconducting
due to some defect.
â€“ May require a sequence of test vectors for
â€“ A combinational circuit can exhibit sequential
Consider CMOS implementation of a 2 input (A,B as inputs) NOR gate where the PMOS transistors are T1 and T2, say.
For detecting T1 stuck-open:
â€“ Apply a two pattern test.
â€¢ First pattern: AB = 10 or 01 or 11
â€¢ Second pattern: AB = 00
â€“ This test will also detect T2 stuck-open.
â€¢ Two-vector s-op test can be constructed
by ordering two stuck-at tests.
Dr. Santosh Biswas Date: