Prahlad J. Purohit wrote:
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and thus can't feed directly to unipolar ADC and thus I need to rectify it

No, you have floating signal source from the CT, you can bias the input to the ADC to half supply and mix in the CT with a single opamp, which doesn't need to be a singlesupply unit either.

Or you use a different ADC and eliminate the opamp - or are you using the DAC ?

Steve