who could explain 3-order intercept point in detail???

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3order intercept

can anyone explain 3-order intercept point in spectre simulation??
if frequence1 is 2.45GHz, frequence2 is 2.35GHz, then 1-order harmonic is 2.45GHz, 3-order harmonic is 2.65GHz??
could you explain it in detail??
because 3-order harmonic isn't exclusive, the IIP3 is different, which is the result i need??

thanks a lot!!

Added after 3 minutes:

another question, what factor affect the IIP3, how can i improve it?? eliminate the common source??
thanks

 

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could anyone explain it for me??
thanks

 

[jallem]

maybe this help you:

http://www4.tpgi.com.au/users/ldbutler/Intermodulation.htm

I like this one:

**broken link removed**