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Harmonic Parametric

AMSboston

Hi,

Below is a SKILL  to find the Harmonic Frequency distortion level.

If I run a single simulation I get the correct answer.

 However, if I run a Parametric Sweep of VAR("fin") I get the following error:

*Error* round: argument #1 should be a number (type template = "n") - drwave:213939744.

 I get the error because "FreqN" is a vector.

How do I modify the script below such that it can handle a Parametric Sweep?

BTW, if freqN was a list or a vector I could make the code work with a foreach command.

However, freqN is not a list, nor is it a vector.

What is it?

####################################################################### 

procedure( CCSharmonicDistNEW( tranwave dftFrom dftTo numSample freqN freq0)
     let( (res dftwave newFreqN)
     dftwave = dft(tranwave,dftFrom ,dftTo,numSample,"Rectangular",1,1)
newFreqN=abs(round(freqN/250e6)*250e6-freqN)
     res = db20( mag(value(dftwave newFreqN))/mag(value(dftwave freq0)))
     res
)
)

 ocnPrint(CCSharmonicDistNEW(VT("/XQDCA/RECONSTRUCTED") 42.2n 298.2n 64 3*VAR("fin") VAR("fin")))
############################################################################################

Parents
  • Andrew,
    Thanks a lot for your help.
    I modified the code below to also recalculate newFreq0.
    When I do so I get the correct result.
    The purpose of this code is to find the HD of signals that are above Nyquist and therefore I had to recalculate freq0 & freqN.
    If you get a chance maybe you can explain the following:
    I actually don't understand the syntax of the solution.
    If the condition that it's a family is satisfied then famMap iterates over every Waveform in the family and calculates a newFreq, which it then applies to the DFT function.
    The syntax is confusing because famMap calls CCSharmonicDistNEW from within CCSharmonicDistNEW.
    How does it work? (I realize this may be a dumb question because it works by recursion, so maybe nothing needs to be said:)
    Thanks for your help!
    ##############################################################################
    procedure( CCSharmonicDistNEW( tranwave dftFrom dftTo numSample freqN freq0)
      cond(
       ; handle ordinary waveforms
       (drIsWaveform(tranwave)
         let( (res dftwave newFreqN newFreq0)
           dftwave = dft(tranwave,dftFrom ,dftTo,numSample,"Rectangular",1,1)
           newFreqN=abs(round(freqN/250e6)*250e6-freqN)
           newFreq0=abs(round(freq0/250e6)*250e6-freq0)
           res = db20( mag(value(dftwave newFreqN))/mag(value(dftwave newFreq0)))
           res
         )
       )
       ; and family waveforms
       (famIsFamily(tranwave)
        
         famMap('CCSharmonicDistNEW tranwave dftFrom dftTo numSample freqN freq0)
       )
       ; oh dear, help!
       (t
         error("CCSharmonicDistNEW - can't handle %L\n" tranwave)
       )
      )
    )
Reply
  • Andrew,
    Thanks a lot for your help.
    I modified the code below to also recalculate newFreq0.
    When I do so I get the correct result.
    The purpose of this code is to find the HD of signals that are above Nyquist and therefore I had to recalculate freq0 & freqN.
    If you get a chance maybe you can explain the following:
    I actually don't understand the syntax of the solution.
    If the condition that it's a family is satisfied then famMap iterates over every Waveform in the family and calculates a newFreq, which it then applies to the DFT function.
    The syntax is confusing because famMap calls CCSharmonicDistNEW from within CCSharmonicDistNEW.
    How does it work? (I realize this may be a dumb question because it works by recursion, so maybe nothing needs to be said:)
    Thanks for your help!
    ##############################################################################
    procedure( CCSharmonicDistNEW( tranwave dftFrom dftTo numSample freqN freq0)
      cond(
       ; handle ordinary waveforms
       (drIsWaveform(tranwave)
         let( (res dftwave newFreqN newFreq0)
           dftwave = dft(tranwave,dftFrom ,dftTo,numSample,"Rectangular",1,1)
           newFreqN=abs(round(freqN/250e6)*250e6-freqN)
           newFreq0=abs(round(freq0/250e6)*250e6-freq0)
           res = db20( mag(value(dftwave newFreqN))/mag(value(dftwave newFreq0)))
           res
         )
       )
       ; and family waveforms
       (famIsFamily(tranwave)
        
         famMap('CCSharmonicDistNEW tranwave dftFrom dftTo numSample freqN freq0)
       )
       ; oh dear, help!
       (t
         error("CCSharmonicDistNEW - can't handle %L\n" tranwave)
       )
      )
    )
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