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how to measure corner frquency in verilogA

Hi,

I want to access a node voltage (in AC sim) and measure the 3db frequency in verilogA , please help me with the syntax.

Here the motivation is use this info and adjust some trim bits to tune the corner freq.. just like any other calibration loop.

Thanks,
yvkrishna

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Andrew Beckett over 7 years ago

You can't do this in VerilogA (you can't really create frequency-domain descriptions, and certainly not this kind of measurement). Typically such a test of a calibration loop would be done with the ADE XL (or Assembler) "pre-run script" mechanism.

Andrew.
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vamshiky over 7 years ago in reply to Andrew Beckett

ok,

Can calibrated verification approach using ADEXL(with calcVal ) work in this case?

Thanks,

yvkrishna
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Andrew Beckett over 7 years ago in reply to vamshiky

Yes, or using the ADE-XL "pre-run script" mechanism - which allows you to run a scripted calibration loop. That's good for doing (say) a binary search for the solution.

Regards,

Andrew.
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vamshiky over 7 years ago in reply to Andrew Beckett

If you remember any example similar to my requirement(filter corner freq. trim) please point to it.

-Thanks,

yvkrishna
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vamshiky over 7 years ago in reply to Andrew Beckett

If you remember any example similar to my requirement(filter corner freq. trim) please point to it.

-Thanks,

yvkrishna
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Andrew Beckett over 7 years ago in reply to vamshiky

We have an example workshop that we could provide via a customer support case. Other than that, I suggest going over the test name in ADE XL, using the right mouse button, and then selecting pre-run script. Enable it, and then hit the Load Template button - you'll get a pretty reasonable idea from the template how to go about running the calibration.

Actually, better still, I just checked and we have a rapid adoption kit: Techniques for Simulating Calibrated Circuits with Virtuoso ADE Assembler

It's focussed on the newer ADE Assembler tool, but most of the techniques (other than the Run Plans) would work in ADE XL (the database will be set up for ADE Assembler though, I believe).

Regards,

Andrew.
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