Propagation time effect PUBLIC

Not provided.

The purpose of this "made up" example it to show the possible influence of the propagation time.

The digital signal of the clock, after two successive "NOT" should revert back to itself, so "X" and "Y" should always have the same value. The output of the XOR should then always be ... zero (false).

That is what the simplistic model of mathematical logic teaches us. But in reality, the output of each gate need "times" to be produced and exposed. That propagation time may be negligeable, if you have a single gate, but may soon matter if you have many stages.

Here, with just two stages (if we don't consider the "XOR" gate), we obtain... pulsations (unstable).