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How to simulatue a Gm-C integrator?

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zoujunjx

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gm-c integrator

My question is how to extract the nonlinearity of a Gm-C integrator, i.e. THD (total Harmonic Distortion). SNR (Signal-to-Noise Ratio) and SDR (Signal-to-Distortion ratio)?
As my knowledge, these perforamnces are from the FFT of a signal. Does it need a tranisent simulation???

In some literatures, the performances 1dB compression and IP3 can also present the nonlinearity.
I am confused by that, Is there any relationship between these perforamnces? Anyone can give me a clear idea.

Thanks in advance!
 

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