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How to improve SNR of sigma delta adc/dac?

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edisonliu

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I have designed a sigma delta adc/dac.But snr is very bad.Can some body give me some suggestion to improve the snr?
 

sigma delta adc/dac

Is your reference stable?
 

Re: sigma delta adc/dac

Did you check whether output of integrator saturate ?
 

Re: sigma delta adc/dac

the reference is stable enough.the output is ok because the input is very small.
 

Re: sigma delta adc/dac

In order to find the peak SNR input should be -3dB below full scale .
 

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