ADS LSSP simulation non convergence errors
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?
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---
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
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.
adding farther, under HB solver you can change solver type, increase iterations, and convergence mode and combination of these.
First, increase harmonics of HB to 31.
Second, increse over sample number, such as 2, 4, 8, ....
See The Designer's Guide Community Forum - maxstep in shooting-envlp of Cadence Spectre
And try to set Transient-Assisted-HB manually.
Don't use automatic set for it.
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