The swing of the first ouput stage in two stage opamp

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iamxo

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My opamp is used in pipeline ADC as MDAC opamp. I use two-stage structure, the first stage is telescopic with the output common-source stage. My query is that whether the ouput swing of the first-stage should be large or not.. when the opamp is in the feedback loop.

Thank you..
 

output swing/ gain of second stage
 

    iamxo

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