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How to add termo noise to ADC output FFT?
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iexplorer



Joined: 08 Aug 2007
Posts: 61
Post23 Jun 2008 5:31   

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 ?
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jiangxb



Joined: 01 Apr 2007
Posts: 340
Helped: 21
Location: hangzhou, china
Post23 Jun 2008 9:43   

Re: How to add termo noise to ADC output 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.
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iexplorer



Joined: 08 Aug 2007
Posts: 61
Post24 Jun 2008 3:40   

How to add termo noise to ADC output 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?
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jiangxb



Joined: 01 Apr 2007
Posts: 340
Helped: 21
Location: hangzhou, china
Post24 Jun 2008 6:06   

Re: How to add termo noise to ADC output FFT?
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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