How to solve the convergence problem while doing Loadpull

[promise2007]

Hi friends, I encountered a problem while doing PA Loadpull simulation, hpeesoft demonstrated the error information as follows:

A virtual resistance of 1 TOhms was added to each node.
Error detected by hpeesofsim during HB analysis `HB1'.No convergence.

Thank you for your answering.


here is the detaied error informatin:

Warning detected by hpeesofsim during netlist flattening.
    Resistor `X1.AHBT16.R2' is shorted.
Warning detected by hpeesofsim during netlist flattening.
    Resistor `X1.AHBT15.R2' is shorted.
Warning detected by hpeesofsim during netlist flattening.
    Resistor `X1.AHBT14.R2' is shorted.
Warning detected by hpeesofsim during netlist flattening.
    Resistor `X1.AHBT13.R2' is shorted.
Warning detected by hpeesofsim during netlist flattening.
    Resistor `X1.AHBT12.R2' is shorted.
Warning detected by hpeesofsim during netlist flattening.
    Resistor `X1.AHBT11.R2' is shorted.
Warning detected by hpeesofsim during netlist flattening.
    Resistor `X1.AHBT10.R2' is shorted.
Warning detected by hpeesofsim during netlist flattening.
    Resistor `X1.AHBT9.R2' is shorted.
Warning detected by hpeesofsim during netlist flattening.
    Resistor `X1.AHBT8.R2' is shorted.
Warning detected by hpeesofsim during netlist flattening.
    Resistor `X1.AHBT5.R2' is shorted.
Warning detected by hpeesofsim during HB analysis `HB1'.
    A virtual resistance of 1 TOhms was added to each node.
Error detected by hpeesofsim during HB analysis `HB1'.
    No convergence.
Error detected by hpeesofsim during HB analysis `HB1'.
    Divergence in the KCL check detected.
    Convergence hints:
    o Double the fundamental oversample.
    o Select the direct solver.
    o Set Matrix Re-use to Robust.
    o Select the Krylov solver.
    o Increase Krylov Restart Length to 150.
    This is the maximum value based on available memory.
    o Try TAHB (transient assisted HB).
    o Select the Robust convergence mode,
    o Increase max. iterations to 100.
    o Select the Fast convergence mode. 
    o Increase the order.
    o Try to sweep a parameter.
    o Increase MaxStepRatio.

Status / Summary

Fwd sourceLevel=37.7605e-03    3.78% 2/2  Step=0.2864222517*...    Arclength Newton-Raphson converged at 0.0408357 in 1 iters

Fwd sourceLevel=77.5025e-03    7.75% 2/2  Step=0.4050622329*...    Arclength Newton-Raphson converged at 0.0730659 in 1 iters

Fwd sourceLevel=109.286e-03   10.93% 2/2  Step=0.5728445034*...    Arclength Newton-Raphson converged at 0.103846 in 1 iters

Fwd sourceLevel=140.814e-03   14.08% 2/2  Step=0.8101244659*...    Arclength Newton-Raphson converged at 0.135964 in 1 iters

Fwd sourceLevel=175.799e-03   17.58% 2/2  Step=1.145689007*...    Arclength Newton-Raphson converged at 0.171093 in 1 iters

Fwd sourceLevel=215.196e-03   21.52% 2/2  Step=1.620248932*...    Arclength Newton-Raphson converged at 0.209668 in 1 iters

Fwd sourceLevel=257e-03       25.70% 2/2  Step=2.291378014*...    Arclength Newton-Raphson converged at 0.249224 in 1 iters

Fwd sourceLevel=296.329e-03   29.63% 2/2  Step=3.240497864*...    Arclength Newton-Raphson converged at 0.289854 in 1 iters

Fwd sourceLevel=341.126e-03   34.11% 2/2  Step=4.582756027*..    Arclength Newton-Raphson converged at 0.336746 in 1 iters

Fwd sourceLevel=398.868e-03   39.89% 2/2  Step=6.480995727*....    Arclength Newton-Raphson converged at 0.396277 in 1 iters

Fwd sourceLevel=479.705e-03   47.97% 2/2  Step=9.165512055*.**..*    rejected

Fwd sourceLevel=436.005e-03   43.60% 2/2  Step=4.36452955*...............    Arclength Newton-Raphson converged at 0.441086 in 1 iters

Fwd sourceLevel=515.11e-03    51.51% 2/2  Step=4.36452955*.******    rejected

Fwd sourceLevel=476.336e-03   47.63% 2/2  Step=2.078347405*.*    rejected

Fwd sourceLevel=457.872e-03   45.79% 2/2  Step=0.9896892404*.***    rejected

Fwd sourceLevel=449.079e-03   44.91% 2/2  Step=0.4712805906*    rejected
Fwd sourceLevel=444.893e-03   44.49% 2/2  Step=0.2244193289*..............    Arclength Newton-Raphson converged at 0.446564 in 1 iters

Fwd sourceLevel=453.867e-03   45.39% 2/2  Step=0.2244193289
*.*    rejected

Fwd sourceLevel=450.042e-03   45.00% 2/2  Step=0.1068663471*...    Arclength Newton-Raphson converged at 0.450097 in 1 iters

Fwd sourceLevel=451.27e-03    45.13% 2/2  Step=0.1068663471*..    Arclength Newton-Raphson converged at 0.451044 in 1 iters

Fwd sourceLevel=452.134e-03   45.21% 2/2  Step=0.1511318374*..    Arclength Newton-Raphson converged at 0.451918 in 1 iters

Fwd sourceLevel=452.914e-03   45.29% 2/2  Step=0.2137326942*..    Arclength Newton-Raphson converged at 0.452695 in 1 iters

Fwd sourceLevel=453.548e-03   45.35% 2/2  Step=0.3022636748*..    Arclength Newton-Raphson converged at 0.453316 in 1 iters

Fwd sourceLevel=453.93e-03    45.39% 2/2  Step=0.4274653883*..    Arclength Newton-Raphson converged at 0.453676 in 1 iters

Fwd sourceLevel=453.892e-03   45.39% 2/2  Step=0.6045273496*..    Arclength Newton-Raphson converged at 0.453607 in 1 iters

Rev sourceLevel=453.177e-03   45.32% 2/2  Step=0.8549307767*..    Arclength Newton-Raphson converged at 0.45285 in 1 iters

Rev sourceLevel=451.392e-03   45.14% 2/2  Step=1.209054699*..    Arclength Newton-Raphson converged at 0.451009 in 1 iters

Rev sourceLevel=447.944e-03   44.79% 2/2  Step=1.709861553*..    Arclength Newton-Raphson converged at 0.447484 in 1 iters

Rev sourceLevel=441.928e-03   44.19% 2/2  Step=2.418109399*..    Arclength Newton-Raphson converged at 0.441341 in 1 iters

Rev sourceLevel=431.898e-03   43.19% 2/2  Step=3.419723107*..    Arclength Newton-Raphson converged at 0.43106 in 1 iters

Rev sourceLevel=415.388e-03   41.54% 2/2  Step=4.836218797*..    Arclength Newton-Raphson converged at 0.414006 in 1 iters

Rev sourceLevel=387.921e-03   38.79% 2/2  Step=6.839446213*..    Arclength Newton-Raphson converged at 0.385191 in 1 iters

Rev sourceLevel=340.331e-03   34.03% 2/2  Step=9.672437594*...    Arclength Newton-Raphson converged at 0.333625 in 1 iters

Rev sourceLevel=249.803e-03   24.98% 2/2  Step=13.67889243*.....    Arclength Newton-Raphson converged at 0.226509 in 1 iters

Rev sourceLevel=24.5025e-03    2.45% 2/2  Step=19.34487519    rejected

Rev sourceLevel=130.315e-03   13.03% 2/2  Step=9.211845328*..*    rejected

Rev sourceLevel=180.703e-03   18.07% 2/2  Step=4.386593013*....    Arclength Newton-Raphson converged at 0.17006 in 1 iters

Rev sourceLevel=98.2967e-03    9.83% 2/2  Step=4.386593013
*....*......    Arclength Newton-Raphson converged at 0.0213915 in 2 iters

--------------------------
Solver convergence summary:
--------------------------
RHS:
6.714e-10  A at node X1.AHBT8.HBT1.ei, harmonic index (5)
6.626e-10  A at node X1.AHBT14.HBT1.ei, harmonic index (5)
6.626e-10  A at node X1.AHBT15.HBT1.ei, harmonic index (5)

Update:
9.619e-07  V at node X1.AHBT2.HBT1.ci, harmonic index (1)
9.619e-07  V at node X1.AHBT1.HBT1.ci, harmonic index (1)
9.619e-07  V at node X1.AHBT6.HBT1.ci, harmonic index (1)

Solution:
369        V at node X1.AHBT6.HBT1.ti2, harmonic index (0)
369        V at node X1.AHBT2.HBT1.ti2, harmonic index (0)
369        V at node X1.AHBT4.HBT1.ti2, harmonic index (0)
--------------------------

-------------------------------------------------------------------------------
Simulation finished with errors.
-------------------------------------------------------------------------------

Resource usage:
  Total stopwatch time     =    88.23 seconds.
--------------------
Simulation terminated due to error.
--------------------

 

[Julian18]

also came across this error some time ago, any one has some clue on how to modify the design to make it stable enough so that no error will appear.

 

[BigBoss]

Why don't you read the hints of ADS in output log??

 

[pir0texnik]

Use file->save in simulation window.
Anyway, is there any helpful suggestions? I have similar problem with envelop simulation. Tried all ADS's advices...