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https://designers-guide.org/forum/YaBB.pl Simulators >> RF Simulators >> PAC PXF results https://designers-guide.org/forum/YaBB.pl?num=1339093254 Message started by ohms377 on Jun 7th, 2012, 11:20am |
Title: PAC PXF results Post by ohms377 on Jun 7th, 2012, 11:20am Why do PAC vs PXF analysis results differ? From the sc-filters sample and hold circuit, I wanted to understand the difference in results from a PAC and PXF analysis: clockAlone pss period=TCLK maxacfreq=125/TCLK directGain pac start=0_Hz stop=10/TCLK maxsideband=25 convGain (sout 0) pxf start=0_Hz stop=10/TCLK maxsideband=25 Note I modified the pxf to have the same start and stop frequency as in the pac analysis. I have attached an image showing the results. |
Title: Re: PAC PXF results Post by Forum Administrator on Jun 7th, 2012, 8:08pm PAC gives the transfer function from a particular range of frequencies at the input to a particular sideband of the output. So for sideband #23, the input is at 0_Hz and the output is at 23/TCLK+0_Hz. PXF gives the transfer function from a particular sideband of the input to a particular range of frequencies at the output. So for sideband #23, the input is at 23/TCLK+0_Hz and the output is at 0Hz. -Ken |
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