How to simulate IIP3 in hspice?

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vvchan

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As I want to simulate the linearity of my VGA, I want to simulate the IIP3 for it.
I know that the method is input 2 pulse into the input and use fft to get the result.
But I feel strange to write in the netlist, can anyone suggest how to write it?
my VGA Bandwidth=400MHz
 

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