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HB AC warnings: Solver did not converge to the desired tolerance of 0.0001

I have been getting the following errors in my HB AC simulations. Would like to get some feedback on how to solve this.

Warning: Solver did not converge to the desired tolerance of 0.0001. It converged to 1. The solution may not be accurate but it's saved anyway.
hbac: freq = 23.1 GHz (1.25 %), step = 100 MHz (1.25 %)
Warning: Solver did not converge to the desired tolerance of 0.0001. It converged to 9.62543e-06. The solution may not be accurate but it's saved anyway.
hbac: freq = 23.2 GHz (2.5 %), step = 100 MHz (1.25 %)
Warning: Solver did not converge to the desired tolerance of 0.0001. It converged to 1.53487e-05. The solution may not be accurate but it's saved anyway.
hbac: freq = 23.3 GHz (3.75 %), step = 100 MHz (1.25 %)
Warning: Solver did not converge to the desired tolerance of 0.0001. It converged to 1.13937e-05. The solution may not be accurate but it's saved anyway.
hbac: freq = 23.4 GHz (5 %), step = 100 MHz (1.25 %)
hbac: freq = 23.5 GHz (6.25 %), step = 100 MHz (1.25 %)

Let me know if you need any further info on this.

Thanks

SJRG

Andrew Beckett over 4 years ago

Which spectre version are you using?

Andrew
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Andrew Beckett over 4 years ago in reply to Andrew Beckett

BTW, the reason your post went into moderation was the repeated text - this triggers the spam detection. It's clearly not spam, but the automated forum software doesn't know that.

Andrew
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Sjrg over 4 years ago in reply to Andrew Beckett

Noted. Thanks for the feedback
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Sjrg over 4 years ago in reply to Andrew Beckett

Spectre version: mmsim60_isr21
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Andrew Beckett over 4 years ago in reply to Sjrg

Really? You're using a simulator version from 15-16 years ago?

I thought the message wasn't current - there's an article which talks about a newer version of the message here: HB small signal analyses gives GMRES stagnation or convergence warnings. but this should be extremely rare nowadays. You're using the very first version of Spectre that had harmonic balance support, and there have been huge numbers of advances since then.

Actually you can't be using that, because there was no hbac in that release - I just checked... but I suspect you're using something old nevertheless.

Regards,

Andrew.
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Sjrg over 4 years ago in reply to Andrew Beckett

You're right. I'm infact using mmsim201_isr1
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Andrew Beckett over 4 years ago in reply to Sjrg

In that case, you should follow the advice in the article I pointed to - which is to contact customer support.

Andrew
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