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# I have a question about ADS smilation, can someone help me? - RF Cafe Forums

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Below are all of the forum threads, including all the responses to the original posts.

asia21c
Post subject: I have a question about ADS smilation, can someone help me? Posted: Mon Aug 22, 2005 11:12 pm

Lieutenant

Joined: Mon Aug 22, 2005 11:03 pm
Posts: 1
When I do Transient simulate using the ADS, it always said that the iternal timestep *** to small at time ***, and I can't find the answer from the help files of the ADS,can someone help me to solve this problem? Thanks a lot

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Guest
Post subject: ADS SimulationPosted: Tue Aug 23, 2005 7:32 pm
If I'm not mistaken, ADS' transient simulation uses adaptive time steps - if a change of any variable is too big from one instant to another, or if a circuit fails to converge (that is, the voltages and currents can't be made to be consistent), then it shrinks the time step and tries again.

Circuits with high Q can cause problems with transient simulations - if you accidentally have a high-Q resonance, that could be your problem. On the other hand, if you intentionally have a high-Q resonance, then you'd best be prepared to do a lot of work!

Good Luck!

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Guest
Post subject: Posted: Tue Aug 23, 2005 10:19 pm
In my circuit I use a delay unit to delay the signal, is it the problem?
If the Q value is too high, can I reduce it? Or other methods, can you tell me how I to do?

Thanks!!!!!!!!!!!!!!!

Posted  11/12/2012
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