ADS simualtion Error problem

Maybe some nets do not have DC path and the harmonic index(0) can not be convergene to a fixed value.

Hi, kayaoo,

It surely have DC path. The problem is that I can't optimize properly. Somtime when I changed some setting, the optimization can go several iterations; next time maybe stop at the 1st iteration at another setting. I have tried Harmonic Balance and Envelope simulation for the same project, but the results are almost same. Is there anyway to solve the problem so that the optimization can run smoothly?

---------- Post added at 06:23 ---------- Previous post was at 05:24 ----------

Here is another error stop message, hope someone can help.

Of course, the Envelope simulation is based on HB. First you can try another solver type to improve convergence rate.
Could you share the project? then I can have a look

Hi, jayce, thanks for your reply. Could you give me your email box? I can send the project to you. Because the intellectual property, I can't share it at the forum.

Here is another error message, I have to increase the max iteration to 153600, the optimization become slower and slower.

Did you try to switch on "direct solver" or "krylov solver" ? I see on the picture you are not running with Krylov solver, sometimes this could help.

I had tried various convergence mode and slover, even read the official manual, and try to adjust various parameters.

Here is the simulation log file.

If I use Krylov slover, it stop soon, even not begin to solve one iteration. If I select robust matrix re-use, and direct solver, it can go at least 1 iteration.

Try Transient Assited HB with activating it clearly.

Show me netlists regarding Analysis statements.

Thank you, Pancho,

I opened TAHB, but TAHB closed auto when doing HB optimum.

The following is the netlist file. If you need more information, pls let me know.

You are invoking optimizer with HB analysis.

Do you mean TAHB does not work when optimizer is invoked ?

You set "FundOversample=8192" in HB setting.
Generally this is extraordinal.

You don't run HB_Noise Analysis, so "OSCwPhNoise" has no meaning.

Try setting "Restart=yes" in HB analysis.

Later I will run your netlist by using ADS2009U1.

Yes.

The ADS suggest me increase more and more, and I found it works, although a little slow.

I see.

Thank you very much.

HB:HB3 MaxOrder=4 Freq[1]=OCXO_freq MHz Order[1]=31 StatusLevel=2 FundOversample=128 \
PackFFT=no Restart=yes OutputBudgetIV=no \

See the followings.
The Designer's Guide Community Forum - maxstep in shooting-envlp of Cadence Spectre
The Designer's Guide Community Forum - ADS HB: Oscillator + Divider

Can your goal target for optimization, "dBm(OCXO_9_1[::,9]) > 0.0" be truely satisfied with the following variable's ranges ?

L1=9.2293 opt { 1 to 22 } \
L2=7.55931 opt { 1 to 51 } \
CM=4.40185 opt { 1 to 220 } \
C2=24.0249 opt { 1 to 470 } \
Cout=94.5039 opt { 0.1 to 100 } \
R=5.6 opt{ 3 to 30 }

Optim:Optim1  OptimType="hpVMO" ErrorForm="L2" MaxIters=500 P=2 DesiredError=0.0

[Optimization of {L1,L2,CM,C2,Cout,R} for target dBm(OCXO_9_1[::,9]) ; Optim1 with HB3 setting Parametric Sweep of OCXO_freq ]

[Parametric Sweep of OCXO_freq ; Sweep1]
        [Optimization of {L1,L2,CM,C2,Cout,R} for target dBm(OCXO_9_1[::,9]) ; Optim1 with HB3]

I just hope the result can reach my goal as close as possible.
Thanks for your reply, the optimum run properly regarding your suggests.

I checked again, the R range should be 1~5.6

Sorry for bring any inconvienience.

Thank all of you, I have got satisfied result.

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