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What is the link between Intermodulation and SNDR

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yefj

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I have an input of two frequencies ,an it goes into a non liniar system shown bellow which gives us intermodulations. Generaly what i do for SNDR is taking the power of the amplitude of the signal and divide it by the sums of the powers of the intermodulations and noise.

But in this solution shown bellow they put some expression as a harmonic destortion which is the ratio between C3 coeff and signal coefficient C1 How it equals to the straight forward definition i described in the start? Thanks.

1601377762780.png
 

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