spectre nport

I am running noise simulation and it indicates that some of the major noise contribution comes from various s-parameter models in my circuit. How does spectre calculate the noise of those models? Technically s-parameter model does not contain any information about noise.

Hi
One way:
passive n-port has voltage noise matrix v=2*k*T*(z+conj(z))
z-is impedance matrix
z can be obtained from s matrix

another way

matrix of noise powers c=(I-S*S')*k*T where ' is transpose and conj

T is Kelvin temperature
k is boltzmann

This is common theory for noise of linear passives

Regards

If the S parameter model doesn?t contain ANY noise data would be impossible to calculate the real noise of the device.

Yes, If device is passive device
The simplest example is resistor