Problem with noise in Sigma delta ADC

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bear7679

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Noise in Sigma delta ADC

I have designed a sigma-delta ADC. I tested the sample and found the snr of the ADC is only 70dB. I could not find where is wrong, who can help me?
Thank you!
 

Re: Noise in Sigma delta ADC

there could be several problems:
1. clocks are overlapping
2. the switches W/L is low (rds is high)
3. opamps alr slow

check them separately!!!

BEST!
 

Re: Noise in Sigma delta ADC

I feel that ur integrator is getting saturated..
can u provide some more detail of ur design so that we can help u..
Regards
 

Re: Noise in Sigma delta ADC

Pls tell us more detail,such as your DSM structure !
 

Noise in Sigma delta ADC

analog DSM structure is more simple than others, i think your structure is all right. but some details in your design perhans is not good considered.
 

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