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Question:Input Offset voltage of OPAMP of S/H of pipeline AD

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op amp input offset

Hi guys

I have a question about the pipeline adc.

In behaviour model of pipeline adc, every issue is ideal except the OPAMP offset voltage of OPAMP in SH.

When i set the offset voltage of opamp in SH 2mV, the enob is about 8.8bit (9.9bit at all ideal issue).

Here i am puzzled with this. Why is the influence of the offset voltage on ADC so large? I thought it should be small!

So what is the mistake? Can someone give me suggestions?

Thanks
 

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