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question about input referred noise

Hi, there:
suppose I have a circuit, and I do three simulations as described below
1) add a port as input probe, set its resistance, say 50 , and run noise analysis, now I can get input referred noise voltage from the result, call it NP.
2) replace the port with a voltage source in series with a 50Ohms resistor, run noise analysis, get the input referred noise voltage ,call it NV.
3) replace the voltage and series resistor with a current source in parallel with a 50Ohms resistor, run noise analysis, get the input referred noise current, call it NI.
Now can any one tell me what's the relationship btw these three quantities.

Thanks.

Originally posted in cdnusers.org by julian2007

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