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Design >> Mixed-Signal Design >> how to consider reference voltage's noise impact on adc output?
https://designers-guide.org/forum/YaBB.pl?num=1514187469

Message started by vincentleung on Dec 24^th, 2017, 11:37pm

Title: how to consider reference voltage's noise impact on adc output?
Post by vincentleung on Dec 24^th, 2017, 11:37pm

hi, guys.
in our common sense, it seems like that adc reference noise should be much smaller than 1LSB. but how does reference noise contribute to adc output noise? how to calculate it in a right way? adc output noise introduced by reference noise should be a convolution of input signal and reference noise in frequency domain? anybody can explain it ? thanks a lot.

Title: Re: how to consider reference voltage's noise impact on adc output?
Post by davidshw on Jan 1^st, 2018, 8:46pm

https://www.bing.com/search?q=How+the+voltage+reference+affects+ADC+performance+site%3Awww.ti.com&qs=n&form=QBRE&sp=-1&pq=how+the+voltage+reference+affects+adc+performance+site%3Awww.ti.com&sc=0-63&sk=&cvid=8CCC4B46D94746B9B4A01E28CFA6AB58

Title: Re: how to consider reference voltage's noise impact on adc output?
Post by Jacki on Apr 4^th, 2018, 11:33pm

I think the noise from reference voltage should be considered as the rms noise, so use the kT/C analysis at the input of the ADC, not the output.