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Need help for ADS- errors, source bandwidth, time step contr

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When we simulate, errors accur as the following,
"Warning detected by HPEESOFSIM during TRAN analysis `Tran1'.
MaxTimeStep reduced to 6.944e-011 to resolve source bandwidth.
Warning detected by HPEESOFSIM during TRAN analysis `Tran1'.
Internal timestep 9.09495e-023 too small at time 2.06961e-019
while simulator using Truncation Error time step control.
Simulation proceeds with Iteration Count time step control.
Error detected by HPEESOFSIM during TRAN analysis `Tran1'.
Internal timestep 6.25000e-023 too small at time 2.41961e-019.
".
Why? What should I do?

Some times the simulations do not converge using default settings
Try using a step of (0.1/Frequency) and try playing around with the
transient simulation settings. Unless you become more specific about
the model components that you use there is no way to further assist you.
Take a look in the ADS examples (especially the one reffering to
Transient Assisted Harmonic Balance) since some very nice convergance
tricks are used there.

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