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help me to understand IIP3 stimulation in the tutorial

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steven_l

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I have a question：

I upload a mixer tutorial.

The tutorial teaches me how to test IIP3 with the help of QPSS+QPAC.

As to the mixer example, variable frf=2.4GHz, and variable flo=2.4GHz. This means fif=0 Hz.

But when stimulating IIP3, frf is set to 2.401GHz, and in the QPAC panel, Sweep Type is set to 2.4011GHz.
If frf=2.401GHz, then fif=1MHz ,not 0 Hz.

Why？




So if a mixer needs frf=2.4GHz, flo=2GHz, meaning fif=400MHz:
how to set frf and QPAC?
Still make frf=2.401GHz and Sweep Type is set to 2.4011GHz？
When plot IIP3, still select 3rd Order Harmonic:1 -2 and 1st Order Harmonic:-1 0?
 

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