Logic redundancy

Logic redundancy occurs in a digital gate network containing circuitry that does not affect the static logic function. There are several reasons why logic redundancy may exist. One reason is that it may have been added deliberately to suppress transient glitches (thus causing a race condition) in the output signals by having two or more product terms overlap with a third one.

Consider the following equation:

The third product term ${\displaystyle BC}$ is a redundant consensus term. If ${\displaystyle A}$ switches from 1 to 0 while ${\displaystyle B=1}$ and ${\displaystyle C=1}$, ${\displaystyle Y}$ remains 1. During the transition of signal ${\displaystyle A}$ in logic gates, both the first and second term may be 0 momentarily. The third term prevents a glitch since its value of 1 in this case is not affected by the transition of signal ${\displaystyle A}$.

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