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Input Reffered noise in VGA (Variable Gain Amplifier)

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 Hi,
I have to calculate "Input Referred noise" of variable gain amplifier.  I choosed analysis--> noise -->  freq. range,
output noise [voltage] +ve and -ve node.

input noise [port] port source

simulation -->
1- direct plot -->noise -->input noise --> v/sqrt(Hz)
2- results ->print --> noise summary
values of noises in 1 and 2 different
could anyone explain me why this happens. ?
I am using ADE L (IC6.1.5.500.8. )
regards,


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