I no longer have access to a scope; I've been wondering about this off and on.
Back in college I pondered a NAND gate with one input held high, and the other input being tied to the output.
Basically wondering about the oscilation, and just how "clean" it might be.
Now I guessing that it's not going to look anything like a clean square wave, because the transition voltages would be met mighty fast. But are the transitions monotonic? If not, does any noise goof up which direction its transitioning when switching that fast?
I suppose what I'm asking is: Is there an odd place where the transition voltages from true to false (and back) are not "quite" enough there to have the NAND output enter an completely undefined state? At first I was assuming that the there would just be a tight cycling around the transition but I'm not sure now what noise and any need for the analog circuits to be "left alone" might cause.
Thanks!