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Defining Noise in VDC by using noise/freq pairs

MicheleA

Hi All,

if I set:

number of noise/freq pairs : 3

Freq1 : 1k

Noise1 : 1e-12

Freq2 : 100k

Noise2 : 1e-18

Freq3 : 1M

Noise3 : 1e-24

I would expect, similarly to what happens with pwl sources in time domain, to get a piecewise linear frequency characteristic.

This is however what I get: 


 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
So indeed the values at the points I have set are correct, but the interpolation is not what I would expect.
What am I doing wrong? It looks like the source is 'understanding' only 20dB/dec slopes..
 
Thanks for your help,
 
Michele
 
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