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How can I measure SNR from sigma delta ADC and decimation?

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boeysue

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measure snr

How can I measure snr from sigma delta adc and decimation after that but not to predict the snr ?
In frequency domain low pass filter has perfect magnitude spectrum but I can't get the perfect mmse snr?I have already considered the delay on it.
If anyone has opoins plz tell me,thx.
 

how to calculate snr for decimation filter?

U can use the digital data to perform a FFT.
In the frequency domain, u can get the SNR and other charactericts.
 

how measuring the snr of a sigma delta adc?

Did you mean to calculate the in-band noise and in-band signal power?How can we consider which frequency bin as in-band signal and in-band noise?Should I take the delay of the signal into consideration? Thx a lot...
 

decimation snr

Can anyone one provide a Matalb file for reference to calculate SNR ?
 

snr after decimation

Did it measure the snr in the same way for the decimation?
And what did it to be called in official?

Code:

Added after 5 hours 26 minutes:

Did it calculate the SNR in the same way in decimation?
Because I got 93db in sigma_delta modulation,it only retain 67 db after comb decimation?I use the example of oversampling rate=256,single bit;
thank a lot.
 

sigma-delta snr

I guess we can measure by using the fft or Pxx performed on the digital output stream of the modulator.
 

measure snr in sigma delta

Get the data of sigma delta adc then do fft in matlab.
 

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