On the design of robust multiple fault testable CMOS combinational logic circuits

Tests that detect modeled faults independent of the delays in the circuit under test are called robust tests. An integrated approach to the design of combinational logic circuits in which all single stuck-open faults and path delay faults are detectable by robust tests was presented by the authors earlier. It is shown here that the earlier design actually results in circuits in which all multiple stuck-at and stuck-open and multipath delay faults are robustly testable. The tests to detect such faults are presented.