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https://designers-guide.org/forum/YaBB.pl Simulators >> RF Simulators >> Question on Sampled PAC https://designers-guide.org/forum/YaBB.pl?num=1577233223 Message started by iVenky on Dec 24^{th}, 2019, 4:20pm |
Title: Question on Sampled PAC Post by iVenky on Dec 24^{th}, 2019, 4:20pm Hi, I am wondering what the sampled PAC does exactly. Let's say I have an LPTV system H(jw,t)=ΣH_{k}(jw) e^{jkwst} where w_{s} = 2Π/Ts where 'Ts' is the periodicity of the system & 'k' is an integer from -∞ to -∞. Here H_{k}(jw) are the harmonic transfer functions. Let's say we have an input x(t)=e^{jwint} to the system H(jw,t) and whose output is y(t) which has the frequency translated input x(t) scaled by the harmonic transfer functions. What does the sampled PAC at a time 't0' actually measure? I can understand PAC voltage gain, which looks at the gain frequency translated output magnitude to input magnitude. On the other hand, what does sampled PAC voltage gain do? Thanks in advance and Happy Holidays :) |
Title: Re: Question on Sampled PAC Post by Frank Wiedmann on Jan 8^{th}, 2020, 7:54am Sampled PAC gives you the signal that you would see at the output of an ideal sampler that is running at the frequency of the PSS analysis (see https://support.cadence.com/apex/techpubDocViewerPage?&path=spectreRFTheory/spectreRFTheory19.1/chap2.html#pgfId-1042551). For an explanation of ideal sampling, you can take a look at Ken's paper https://designers-guide.org/analysis/sc-filters.pdf. When he wrote it, the sampled PAC and PXF analyses had not yet been implemented in SpectreRF, so he used an ideal sample-and-hold written in Verilog-A. |
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