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    when calculating the SNR of adc,should the bandwidth of noise be 1/2fsample?

    when calculating the SNR of adc,if i want to calculate all the noise,should the bandwidth of noise be 1/2fsample?in the book,its said that the quantization noise of adc is distributed in the range from zero to 1/2fsample.and i have another question.when calculating the noise of a sigma delta adc from the output of its digital filter,should the integration bandwidth of noise be set to 0 to 1/2 of the clock frequency of the output digital code?

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    Re: when calculating the SNR of adc,should the bandwidth of noise be 1/2fsample?

    Quote Originally Posted by alex_fd View Post
    when calculating the noise of a sigma delta adc from the output of its digital filter,
    should the integration bandwidth of noise be set to 0 to 1/2 of the clock frequency of the output digital code?
    No.
    It should be effective bandwidth of digital filter which is less than 1/2 of the clock frequency.



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    Re: when calculating the SNR of adc,should the bandwidth of noise be 1/2fsample?

    Hi,

    many audio ADCs work with higher sampling rate, then they use digital filters, then they reduce the data rate.....
    Thus 1/2 f more relates to the output data rate than to the true sampling rate.

    --> I'd choose the bandwidth to the "typical bandwidth of interest of the ADC".

    Klaus
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