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https://designers-guide.org/forum/YaBB.pl Simulators >> RF Simulators >> PXF analysis problem https://designers-guide.org/forum/YaBB.pl?num=1387365290 Message started by hslsc311 on Dec 18th, 2013, 3:14am |
Title: PXF analysis problem Post by hslsc311 on Dec 18th, 2013, 3:14am dear all i need your help,here is my question:i want to use PXF analysis of spectreRF simulator to evaluate the power noise effect on the phase noise of VCO output.but i cannot get the waveform. my PSS setting is like this: .beat freq=400M //VCO output 426M .number of harmonics =10 .accuracy default: moderate .tstab=200n .hlight oscillator and choose OSC node and reference node my PXF setting is like this: .sweeptype=relative and relative harmonic=1 .sweep range:1K to 250M .points per decade =10 .maximum sideband=1 .select positive output node and negative output node .choose modulated for specialized analysis .outputtype=SSB/AM/PM .input modulated harmonic list=1 0 .output modulated harmonic =1 after the simulation,i select the direct plot form,and click "pxf modulated",choose SSB for input,PM for output;0 0 for modulated input harmonic and 426.903M 1 for modulated output harmonic. however,after i selected the power voltage source.simulator told me : *error* mag: can't handle mag(nil) *error* evaluating expression (_drplModPxfVGain('SSB 0 'PM 1 '("/V0" "/VDDA/" "/gnd!"))) *error* ("difference" 0 t nil ("*error* difference:can't handle (nil - 0.0)")) |
Title: Re: PXF analysis problem Post by hslsc311 on Dec 19th, 2013, 1:20am addition: the simulaltion is run normally, i just canot get the waveform |
Title: Re: PXF analysis problem Post by Andrew Beckett on Dec 27th, 2013, 10:31am Which subversion of Virtuoso are you using (Help->About in the CIW), and which subversion of spectre (this will appear at the top of the spectre output log). I was using IC615 ISR17 and MMSIM131 ISR2 - and I followed the steps you are doing and was able to plot the waveforms OK from the direct plot form. Regards, Andrew. |
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