I want to design a Split DAC for 14-bit SAR ADC. I am confused regarding the selection of minimum unit capacitor for the DAC unit. I know mismatch requirements and thermal noise imposes limit on the use of minimum capacitance.

To satisfy thermal noise requirement I am using this formula sqrt(kT/C)< Vref/(2^(N+1)). But how to mitigate the effect of mismatch?

Please help

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