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adesign

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freq_meter component in ahdlLib
Dec 08^th, 2006, 1:48am

Dear all,

I'm using freq_meter component from ahdlLib to calculate instantaneous frequency of an oscillator. While doing Spectre simulation, I'm getting the error as

==========================================================
Error found by spectre at time = 20.6089 ns during transient analysis `tran'.
Signal FF(FREQ_OUT) = 2.18688 GHz exceeds the blowup limit for the quantity
`FF' which is (1 GHz). It is likely that the circuit is unstable. If
you really want signals this large, set the `blowup' parameter of this
quantity to a larger value.
==========================================================

Please let me know how to resolve this issue.

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ACWWong Community Fellow Offline Posts: 539 Oxford, UK	Re: freq_meter component in ahdlLib Reply #1 - Dec 8^th, 2006, 2:38am you need to increase the blowup limit for the nature Frequency. See the relevant previous post. http://www.designers-guide.org/Forum/YaBB.pl?num=1160447769/1#1
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Ken Kundert Global Moderator Offline Posts: 2384 Silicon Valley	Re: freq_meter component in ahdlLib Reply #2 - Dec 8^th, 2006, 2:33pm Do you really need the frequency to be a signal? Is it driving something else in the circuit? If not, modify the model to make the frequency a local variable rather than a signal. Then plot it using the waveform browser. -Ken
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Ken Kundert

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Posts: 2384
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Re: freq_meter component in ahdlLib
Reply #3 - Dec 8^th, 2006, 2:51pm

All,
Please remember that this forum is a general resource for everyone. As such, you should try to ask your questions in a way that everyone benefits from the answer. In that spirit, if you have a question or comment about a model, you should include the model here or give a pointer to where it is publicly available. If you ask about proprietary models that many visitors do not have access to, then you limit the number of people that can answer your question and the number that benefit from a response. If you really need to ask a question about a proprietary model, try to develop an abstract or alternate version that exhibits the same behavior and use that to ask your question.

Thanks,
-Ken

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