answer is not the expected.

[lacy]

First, I am seeing a 100mv Max signal coming out of the last inverter. Now I would like to know what you are expecting out of this. With all those capacitors in the inverter circuit it seems to me to be attenuating the signal severely. Let me know what voltage value you are looking for, then maybe I can have a better idea of where to look, because right now I can see no fault.

[jorgealexvilla]

The output voltage is not the problem. What i think is that the output freq should be the equal to the input freq, as you can see it is not happening in the simulation, i mounted the circuit in a protoboard and it worked fine, both freq are equal. 

[lacy]

To clarify what I am seeing. In the default circuit with J3 open and J2 closed is 100mV out. When I close J3 and leave J2 closed I get a 2V Semi-square wave.

[lacy]

O.K. Sometimes I can be real dumb, but I now see what you are seeing. The signal just seems to die right after the first inverter. I cannot figure out why though. I even tried replacing it with another one and it still done the same thing.  This may have more to do with the way these components are modeled than any error in your circuit. I don't have a solution to get around this quite yet. If I do find one I will definitely let you know. In the meantime, if some else has an option then we are all ears.

[lacy]

I am sorry I have misunderstood your problem. It is sometimes difficult to explain to another person on the forum what it is that you are actually having problems with and it is even harder to crawl inside your mind to figure out what you are seeing (LOL).  Anyway, all joking aside, The frequency is the same as the input even though it may not look like it. What has happened is that you have phase-shifted the output up the input signal so that the zero crossing points are different. If you put your cursors on the input waveform at the first instance it crosses zero and then measure one cycle you come up with 16.786 ms or somewhere near it . Now if you place your cursor on the second waveform at the first instance it crosses zero and then measure one cycle you come up with exactly the same reading of the first waveform.

I hope this is what you are looking for.

Message Edited by lacy on 08-17-2007 06:14 PM