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high OSR - advantage of first order modulator

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ycm

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high OSR

for designing a high resolution delta sigma ADC, if the input to ADC is low frequency signal say 1kHz, if I use first order single bit with very high sampling frequency say 100MHz (OSR=50000), I can achieve a SNR over 140dB. I can also using higher order modulator to achieve the similar SNR. what is the disadvantage by using first order modulator here?

BTW: How do you get the conversion time for one sample in delta sigma ADC?

Thanks.
 

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