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How to add termo noise to ADC output FFT?

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iexplorer

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thermal noise in adc

since trans. simulation in cadence would not show the effect of thermal noise such as opamp , How can I add it in the ADC output 's FFT ?
 

hi iexplorer,

do you only want to show the effect of thermal noise in output spectral? if so, i think that you can add a time-domain random number scaled to the output of adc and perform the fft.
 

thanks jiangxb,

how can I define the range of the time-domain random number? Need I to calculate the opamp noise and transfer it to effect of digital output?
 

yes, you can calculate the noise of opamp firstly, and then generate the random number with the variance from the opamp's noise. the thermal noise is Gauss distribution, so it can be calculated by 3-σ rule.
 

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