I am measuring both the 10 MHz (5V pk-pk) input signal, and the output signal of the above mentioned inverters. Why does the output signal looks so much different than the input? I have decoupling capacitors on the supply, near the chips, the supply is stable, there are really no differences between the measurements, other than that I am probing a different pin.
The images below are the result of the CD 4069, but the CD 40106 schmitt trigger version produces very similar results as well.
I forgot to adjust the probe scale on the scope, this is why you see these high numbers, but I am doing it with 1:1, and the levels are good.