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AD8139 noise response

Question asked by sabyasachinit@gmail.com on Jun 13, 2015
Latest reply on Jun 7, 2016 by Yvan

I am trying to measure noise voltage spectral density and I found that simulation result is way off the mark from the value of 2.25 nV/sqrt(Hz) which datasheet has given. I tried simulate it in pspice and multisim independently and the result was the same. I tried to measure the noise in a real system and found that measured noise agrees to the datasheet.

 

I have downloaded the spice model from Analog device website itself.

 

Can anybody check the AD8139 model attached and pinpoint the issue in the model.Multisim_AD8139.jpeg.jpg

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