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Speed up the transient simulation in ADEL

I am trying to simulate a very large circuit having some control digital input which I need to change multiple time during simulation. It has different logic states which I need to verify. For verification I have to run the simulation for every logic states. The circuit takes a lot of time to settle because of its slow transient behavior and I can apply the logic state only after the transient behavior is over. Can I save this initial transient behavior to some file and use the same file to start my simulation for every logic state? This initial transient behavior is independent of logic state given. In that way, I will save my simulation time. Is there any other approach to fasten the simulation?

illaoi over 2 years ago

Hi Firdos,

Please take a look at the following, might be helpful on fastening the simulation by using Spectre X.
Spectre X Simulator | Cadence
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ShawnLogan over 2 years ago in reply to illaoi

Dear Firdos,

Firdos said:
The circuit takes a lot of time to settle because of its slow transient behavior and I can apply the logic state only after the transient behavior is over. Can I save this initial transient behavior to some file and use the same file to start my simulation for every logic state? This initial transient behavior is independent of logic state given.

An easy way to do this is to run your first simulation in the set and save its operating point at a time in the simulation where you feel it is close to its steady-state operation. Using this set of node voltages saved in the file, you can run the subsequent simulations in the set using the file as a set of initial conditions. So, for example, if the limiting time of your simulation is the voltage on a large capacitor in the circuit, you will be choosing an initial condition for the capacitor very close to its steady-state voltage at the start of your next simulation. The times at which you want to save the operating point are chosen in the infotimes dialog box entry within the transient analysis options GUI. Some information on this maybe found at the Troubleshooting article at the On-line support portal at URL:

https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O3w000009bgH3EAI&pageName=ArticleContent&oMenu=People%20who%20viewed%20this%20also%20viewed

with a more extensive document describing specifically how to use a file containing the operating points as a set of nodesets or initial conditions at:

https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1O0V0000091CAfUAM&pageName=ArticleContent

I hope this helps Firdos!

Shawn
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