Paul
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Hi Ravi,
as you mention, the theoretical resolution, given by the quantization noise, of the modulator depends on the OSR, the order and the number of levels of the quantizer. You have to check if the amplifiers (and switches, in case of a switched-cap implementation) offer sufficient BW to work at a higher frequency. You can typically tune the amplifier BW adjusting biasing currents (up to some extent at least), but take care of switches on-resistance. It may add to the thermal noise budget.
Paul
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