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Question about output accuracy integrating circuit

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firsttimedesigning

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I am trying to design an op-amp that is going to be used in an integrating circuit for integrating ADC. The trouble that I am having is that the integrating circuit's output is not accurate enough. For example, when the output is suppose to be 0.5V, it is 0.483V instead. Even if I use an ideal op-amp, the output is still not accurate enough. It is 0.494V instead of 0.5V. I would like the actual output to be at least 200uV within the theoretical output. Any idea how to do it?
 

maofeng

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Re: Op-Amp

what is your DC gain, bandwidth and UGB? It sounds like related to DC gain.
 

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