dft for sampling switch

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amr hema

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hi all,
i have designed T.G switch with another dummy T.G for sampling switch , my clock is 20Mhz , i used it for sar adc 8-bit , so how can i measure snr and thd for this switch , how can i choose fin , Nrecord , Nwindow ??

please i am in deep need for answer

thx in advance
 

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