geex said:I would want to know and see the phase changes that a net undergoes while the oscillator is in stable state. It probably makes sense to say the phase is proper. else we would not be getting a oscillation in the first place at all. But just for a better clarity and understanding it would be great to know the various phase and magnitude changes that a various nets in the circuit undergoes.
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Geex
geex said:... I rather have to see some "magnitude n phase changes", but am not sure how to see them. ....
Is there a way I can see the waveforms coming out from a spectrum analyzer ( the mag n phase probably with some noise characteristcs too) by running some simulations .
I was trying to find some help online and found that doing a pss (periodic steady state) and pnoise simulation will help us to find the noise characteristics of a oscillator. Is there anything else???
geex said:Yes, I want to see something in the frequency domain.
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And actually I am confused if I am getting it wrong here. Dont we see a bell-shaped curve ( with freq. on the X axis ) when we connect say an osc to the spectral analyzer.
I had attached a picture of the waveform I am typically looking to see.
Very often the source of misunderstanding is an incorrect wording. Your picture does NOT show any waveform ! It is an enveloppe of a spectral distribution - right ?
I would like to see the noise characteristics of the circuit ( thats why the spectrum analyzer, correct me if I am wrong here ).
Where do you want to see the noise? On an analyzer or on a pc screen (simulation) ?
I had a colleague suggest to me that I use a tool called multisim for doing it ( I believe multisim will make it easier for the design to PCB board sim ), but the prob with that is I am not sure what type of FET I should be using for the simualtion.
I suppose it makes sense to use the same FET type for simulation as is contained in your circuit. Or didn´t you select any type up to now ?
Question: Is "noise" the last remaining design problem for you ? If not, I would concentrate first to other design issues.
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