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axlAddOutputExpr() does not plot signal

Dear all,

I have made a simple OCEAN measurement script to sample a signal in my system and adding it to the results pane in ADE XL. Though, I am seeing in the results pane the output "Discrete Feedback Signal", but without the plotting symbol (empty field). Underneath the important part of the script:

session = axlGetWindowSession()
setupDB=axlGetMainSetupDB(session)
sessionObject=asiGetSession(session)
psfDir=asiGetPsfDir(sessionObject)
openResults(psfDir)
selectResults('tran)

;Get variable names and values

variableNames=cadr(axlGetVars(setupDB))
period=cdfParseFloatString(axlGetVarValue(axlGetVar(setupDB "tperiod")))
samples=cdfParseFloatString(axlGetVarValue(axlGetVar(setupDB "OSR")))
endTime=(samples-1)*period

;Adding and evaluating expressions in ADE XL
initTime = (period*2-period/4)
stepValue = period
axlAddOutputExpr(session testName "Discrete Feedback Signal" ?expr "sample(VT(\"/dac_out\") initTime endTime \"linear\" stepValue)" ?plot t ?save t)

Kind regards,

Nicolas

Parents

Dimitra Papazoglou over 6 years ago

Hi Nicolas,

What virtuoso version are you using?

Also, after loading the script so expression is added as output, do you re-evaluate existing sim results or run a new sim to get your expression result?

If you do RMB->Plot on the empty field, does it plot?

Regards,

Dimitra
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Nicolas Callens over 6 years ago in reply to Dimitra Papazoglou

Hi Dimitra,

I am using IC6.7.1. Strange enough, I have deleted and added my script in the output pane of ADE XL and now it works... Normally, I reloaded and ran the simulation again. However, I still get an empty field at the expression in the results pane in ADE XL, but when I double click it then the plot appears. Why does ADE XL does not show a plotting symbol?

Thanks!

Kind regards,

Nicolas
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Dimitra Papazoglou over 6 years ago in reply to Nicolas Callens

Hi Nicolas,

It might be related to the particular IC6.1.7 release you are using.

I tried quickly your script with IC6.1.7-64b.500.22 running single point sim and the waveform icon (plotting symbol) is displayed.

To find out the release go to CIW menu and select Help->About Virtuoso.

Regards,

Dimitra
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Nicolas Callens over 6 years ago in reply to Dimitra Papazoglou

Hi Dimitra,

I'm having IC6.1.7-64b.500.15.

Kind regards,

Nicolas
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Nicolas Callens over 6 years ago in reply to Nicolas Callens

Additionally, I have also a question about exporting this waveform in MATLAB. I am using the Spectre Toolbox for MATLAB. I'm seeing all the output signals that I have specified with "axlAddOutputSignal()" except "Discrete Feedback Signal" from the axlAddOutputExpr() in the MATLAB cds_srr() information string.

Kind regards,

Nicolas
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Nicolas Callens over 6 years ago in reply to Nicolas Callens

Additionally, I have also a question about exporting this waveform in MATLAB. I am using the Spectre Toolbox for MATLAB. I'm seeing all the output signals that I have specified with "axlAddOutputSignal()" except "Discrete Feedback Signal" from the axlAddOutputExpr() in the MATLAB cds_srr() information string.

Kind regards,

Nicolas
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Children

Andrew Beckett over 6 years ago in reply to Nicolas Callens

Hi Nicolas,

The Spectre Toolbox can only see waveform data that was saved by the simulator. It cannot see the results of ViVA calculator expressions (the results of which are not said to disk if they are waveforms, which this is).

Regards,

Andrew.
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Nicolas Callens over 6 years ago in reply to Andrew Beckett

Hi Andrew,

Oh, That's a shame. Can I use the cds_evalsig() then for sampling a signal at specific timesamples. I have read the manual, but it is still a mystery how to do this by using cds_evalsig().

Kind regards,

Nicolas
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Andrew Beckett over 6 years ago in reply to Nicolas Callens

Hi Nicolas,

cds_evalsig isn't the function for the job. That's for simple filtering of swept data - it wouldn't be suitable for re-sampling because it can only pick original points and not interpolate between results.

Luckily MATLAB has a function, cunningly named resample which does this. One of the forms is to give the y-vector, the x-vector, and the sample rate (so 1.0/sampleInterval). For example:

[y,x]=resample(mysig.V,mysig.time,1e9)

resamples with a 1ns time step - the output is the new y-vector and the new-sampled x-vector. mysig is the signal read with cds_srr.

Regards,

Andrew.
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Nicolas Callens over 6 years ago in reply to Andrew Beckett

Perfect! Thanks Andrew!
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