Intermodulation intercept point
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The intermodulation intercept point is an odd-order harmonic intercept point that falls inband. For instance, the 3rd order frequencies 2*f1-f2 and 2*f2-f1 or the 5th order 3*f1-2*f2 and 3*f2-2*f1.
The 3rd order Intermodulation power will generally grow at 3 times the rate of the original frequency.
Often abbreviated as IIP.