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i would need more specifications to help! sampling frequency, Bandwidth and Resolution and DT or CT and almost always if low OSR and high bandwidth then its CT.
I would say if you know what you are doing in layout, you could do a 2nd order single bit DT sigma delta converter with an OSR of 64 so, Fs of 2.56Mhz so your amplifiers need a GBW greater then 10MHz, then this yields a SQNR of 79dB. You would also need to have a DC gain meet this equation Pi(Ao+2)>>OSR, which shouldn't be a problem, just keep it in mind! You would then just need to meet your Kt/C requirements so not to lose to much in SNR.
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