The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
Aug 10th, 2020, 8:42pm
Pages: 1
Send Topic Print
Question on Sampled PAC (Read 279 times)
iVenky
Community Member
***
Offline



Posts: 88
Silicon Valley
Question on Sampled PAC
Dec 24th, 2019, 4:20pm
 
Hi,

I am wondering what the sampled PAC does exactly.

Let's say I have an LPTV system H(jw,t)=ΣHk(jw) ejkwst where ws = 2Π/Ts where 'Ts' is the periodicity of the system & 'k' is an integer from -∞ to -∞.
Here Hk(jw) are the harmonic transfer functions.

Let's say we have an input x(t)=ejwint 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 Smiley
Back to top
 
« Last Edit: Dec 25th, 2019, 11:18am by iVenky »  

Life is a nonlinear system. The goal is to find a solution with the least error and not an exact solution.
View Profile   IP Logged
Frank Wiedmann
Community Fellow
*****
Offline



Posts: 670
Munich, Germany
Re: Question on Sampled PAC
Reply #1 - Jan 8th, 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/spec...). 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.
Back to top
 
« Last Edit: Jan 9th, 2020, 1:19am by Frank Wiedmann »  
View Profile WWW   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2020 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.