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Design >> RF Design >> IIP3 test for mixer
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Message started by rf_jay on Sep 29^th, 2008, 1:58am

Title: IIP3 test for mixer
Post by rf_jay on Sep 29^th, 2008, 1:58am

what do you mean by "extrapolation point" while doing IIP3 test for mixer.
What should the value be for it?? how to decide/calcuate extrapolation point?

thanks n regards,
JT

Title: Re: IIP3 test for mixer
Post by didac on Sep 29^th, 2008, 6:57am

Hi,
When you look at an IIP3 simulation/measurement you will see that for medium powers the traces follow a slope of 1 and 3, for higher levels of power the mixer will go to compression. So you must choose an input power level were the slope of 3rd order is still 3 and make a linear extrapolation of the intercept point.
Hope it helps,