Correct offset and gain error Multi-ramp integrator ADC

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brito.tb

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Hi, I'm projecting an ADC to my graduate project and facing some dificulties in remove the offset and gain error.
Can you explain me how to remove these errors?
It's a 8 bit ADC and in the figure is the conversion.
Thanks,
 

offset can be reducing by using offset storage comparator, correlated double sampling(CDS) … the gain error can be reduced by using larger Cap for better matching, trimming, digital correction, and so on
 

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