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Author Topic: What's your best way to get SPICE to converge?  (Read 905 times)
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solutions
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« on: August 16, 2011, 05:18:53 05:18 »

I try sprinkling multi megohm resistors in to try to get it to behave. Sometime slow rise/fall of signal generatiors.

What have you done, or has become a habit, to get SPICE to converge?

Is there a better SPICE implementation (convolutional simulator like ADS for example) that you've experienced?
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optikon
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« Reply #1 on: August 16, 2011, 12:53:14 12:53 »

** Changing solution method (Gear versus trapezoidal) - Gear lends itself better to switching type circuits

** Adjusting .options, namely ITLn and loosening up tolerance (VNtol, Charge tol, Rel tol)

** Replacing subcirucits with simpler versions (sometimes opamps for example)

** Adding realistic parasitics. Series R, C to Ground some L sometimes. Can help with AC/transient events.


I have only experimented with ADS a little bit but I like what I see so far. Most Spice simulators use the same basic core engine.

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solutions
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« Reply #2 on: August 16, 2011, 09:49:44 21:49 »

Correct.  But ADS does not - it uses a "convolutional simulator". Much faster.
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