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X-parameters, IMD, and recommended ext. source

Question asked by MADENGR on Sep 5, 2017
Latest reply on Sep 21, 2017 by Chad

I ordered the X-parameter book, but have a few questions:

 

1) I realize I need true 2-tone X-parameter extraction to properly characterize IMD, and 1-tone extraction will get me AM-AM and AM-PM.  Though AM-AM will contribute to IMD and cause spectral regrowth.  So there seems to be a disconnect.  There was a paper that showed IMD from 1-tone measurement, but the IMD3 fit was pretty poor.  Should I be using two sets of X-parameters; one for IMD (predicting spurs in conversion chains), and another for EVM?

 

2) I'm using an external source to drive the comb generators.  Is this really necessary (can I use the 10 MHz source) since I'll have to get another generator for the two-tone source?

 

3) What generator do you recommend for the two-tone source?  One that has decent IMD performance using it's internal ARB.  For now, I probably don't need to go past 6 GHz for the drive tones.

 

4) Will I be able to extract a single 2-tone X-parameters file over both swept frequency, power, and tone spacing?

 

Maybe this is covered in the book, but I figured I'd ask as I wait for it's arrival.

 

Thanks,

Lou

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