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How to drive a SC sigma delta ADC with high liearity?

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qslazio

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Folks,

Anyone has experience or idea of how to drive the switched capacitor sigma delta ADC to achieve the high linearity especially for high SNR ones (i.e. sample cap is big)?
Suppose the linearity performance of the ADC is high enough, it seems that the front-end opamp like PGA to drive the ADC is the bottleneck.

I saw some people use a slow amp with big cap and others use a fast amp with less cap. Which approach is better? I can not find any reference about this.

Thanks
qslazio
 

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