Jean-Pierre, Capture the digital samples from the ADC and process them using a DFT that should allow you to determine the dynamic performance. If you want to characterise the ADC you may want to consider INL and DNL, depending on the ADC's application these maybe more important. There is plenty of information and app notes from ADC manufacturers out on the net around this and some good books too. Regards, Eoin jean-pierre bouthemy wrote: >Hi SI experts, >I have a question regarding Analog-to-Digital Converter (ADC) measurement and >characterization. >I'm affraid this topic is a little bit more "RF-related" than SI, but I hope >you will be able to answer my questions... > >If I want to characterize an ADC, my feeling is that ENOB (Effective Number Of >Bits) measurement is the best way to evaluate its performance. >I don't know if I can measure ENOB parameter, but I know that if I measure >SNR, THD and SINAD, I can calculate ENOB with the formula: > >ENOB = (SINAD - 1.76 dB) / 6.02 > >Now, I have to know how to measure SNR, THD and SINAD on my ADC. >I can not find papers on the web about that? > >What I don't know is how to connect the DIGITAL N-bits parallel output of the >ADC to the ANALOG 50 ohms input of the spectrum analyser?? >What should I put between ADC output and spectrum analyser input without >adding more noise? > >Furtermore, any advice on ADC SINAD measurement method would be much >appreciated. > >Your help is really welcome. > > >Thank you. >Jean-Pierre Bouthemy > > > > > >------------------------------------------------------------------ >To unsubscribe from si-list: >si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > >or to administer your membership from a web page, go to: >//www.freelists.org/webpage/si-list > >For help: >si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > > >List technical documents are available at: > http://www.si-list.net > >List archives are viewable at: > //www.freelists.org/archives/si-list >or at our remote archives: > http://groups.yahoo.com/group/si-list/messages >Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > > > > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List technical documents are available at: http://www.si-list.net List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu