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Simulators >> RF Simulators >> Monte Carlo Analysis with QPSS
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Message started by nxing on Aug 6^th, 2007, 12:08pm

Title: Monte Carlo Analysis with QPSS
Post by nxing on Aug 6^th, 2007, 12:08pm

Hi there,
I am running a Monte Carlo for QPSS analysis and
would like to measurement some non-linearity
characteristic of a mixer. The problem I am facing
is how to pick up a proper
harmonic that can be used as part of the
expression for Monte Carlo analysis. For example,
the frequency of (-1 1 0) and (-1 2 -1). I know I
can use function of "Harmonic" from special
function of calculator with PSS analysis. How to
set it up with QPSS?

Thanks

Title: Re: Monte Carlo Analysis with QPSS
Post by Bill Toole on Aug 8^th, 2007, 5:17am

The syntax for qpss is quite similar to pss, the only main difference is you specify the mixing product for qpss not the harmonic number since there is no "harmonic" as there is in pss

Below is the syntax for the magnitude of the IF output voltage of a third order intermod product for a mixer with 2 tones at the RF
PSS -> harmonic(v("/IFP" ?result "pss_fd") '(24))

QPSS -> harmonic(v("/IFP" ?result "qpss_fi") '((1 -2 1)))

Bill

Title: Re: Monte Carlo Analysis with QPSS
Post by nxing on Aug 8^th, 2007, 1:17pm

Hi Bill,

Thanks for your reply. I actually tried this syntax before and the icfb reports that there are too many parameters for the function of harmonic.

Regards,

Nxing

Title: Re: Monte Carlo Analysis with QPSS
Post by Bill Toole on Aug 9^th, 2007, 4:52am

Curious. I got the syntax from from using the Direct Plot Form and selecting the "Add To Outputs" button. You can then copy the expression from the "Setting Output" window into the calculator and it should work fine. I generally do this to make equations/expression that are not in the direct Plot Form and have had no problems unless I have changed the simulation in some way

Bill

Title: Re: Monte Carlo Analysis with QPSS
Post by Andrew Beckett on Aug 27^th, 2007, 10:09pm

nxing,

Are you sure you got the parentheses in the right place? You might want to post the expression you used which gave the error about too many parameters?

Regards,

Andrew.

Title: Re: Monte Carlo Analysis with QPSS
Post by nxing on Aug 28^th, 2007, 5:21pm

Actually, it works now.
Thanks for the input.