Explanation of hazard using an example:
An electronic switch forwards signal A or signal B to the data line depending on the control signal. See the circuit design and circuit:
If we now switch the signal at control input S from log. 1 to log. 0, we get what is known as a glitch. Why? The non-element has a certain runtime delay (assumed to be 4 ms). This runtime delay is forwarded as a glitch at the output (note: for the sake of clarity, the delays of the AND elements have been neglected):
How to avoid hazards
To avoid hazards, an additional group can be created in the Karnaugh-map so that all groups are linked together. In our example, this looks as follows:
