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ADS LSSP simulation non convergence errors

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bubuta77

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Hi
I simulate the PA using model from Infineon. I can't do the load-pull properly because of non- convergence errors. Additionally when i run LSSP simulation the results is the same. When i decrease the input power by 5-10dB from saturation level the problem dissapears. HB for single tone when i make some changes at setup (Krilov method) i can work at saturation levels.
I used to work with AWR and never see such problems. Is it model fault or i do something wrong?
 

Manjunatha_hv

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Hello bubuta,

Yes, it may be due to inefficient model development ....Also change the convergence settings in MWO HB...
Try upload your MWO file here, we can help you better....



---manju---
 

bubuta77

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Unfortunately i don't have AWR model it's a reason why i move to ADS. It's really start to look like model problem because when i make same simulation with different tranzistor (Freescale one) it works pretty fine without my changes at HB setup. Anyway thanks
 

BigBoss

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in HB Controller block, there are different options targeted to specific problems.You'd better to read the principles of HB method and research in application notes of Agilent to resolve your problem.
 

bubuta77

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adding farther, under HB solver you can change solver type, increase iterations, and convergence mode and combination of these.
I know, It converges when Krilov solver is set and at advanced settings the preconditioner set to SCP (it's for highly non-linear devices - i do read the manual). But still the behaviour is not stable change of some parameter can cause to non-convergence. Additionally the LSSP can't converge.
I move to freescale model - works pretty fine
 

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