phase noise optimization using ADS

Hi people

This question was asked before but no one solved it.

I am trying to optimize VCO phase noise but I face expression error how can I solve it ?

You have an optimization goal for PN but at which off-set frequency ? You should define first your off-set frequency where the PN has to be best then you do a HB+PN simulation at single off-set frequency after that optimize it at that point.

I tried it also.

I defined PN=pnmx

the problem is, it does not understand pnmx as an expression.

I also do single point phase noise simulation (1Mhz) but the problem is expression.

What should I write there instead of pnmx ?

Yes, it does not recognize pnmx as a function.

Show me your ADS Netlist.

Can I show the schematic ?

Cross coupled vco and I use noisecon NC1 and HB

No.
Show me ADS Netlist.
I don't need circuit netlist at all.

Can you surely understand data structure of ADS results, that is, full name of output ?

"pnmx" is not full name.

netlist:

vconet.txt

Try to set full name instead of "pnmx".

what is the full name ? My problem is this.

If I know how to write the name why would I post here ? :D:D

I have tried NC1.pnmx gain_out.pnmx hb_noise.von.pnmx ... it is not working

If you have one single optimization variable let say an Inductor, try to sweep this component at single PN off-set frequency and see what happens.And repeat for possible optimization variables while the others are fixed
At least you'll have the sensitivity of the PN against a component.

I know I can do that but everything depends on each other Its not a good idea to sweep one and keep others constant. I tried this method in cadence virtuoso but I want better optimization.

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