How does spectre handle noise from s-parameter nport device?

[ezbentley]

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.

 

[yjkwon57]

Re: How does spectre handle noise from s-parameter nport dev

The circuit simulator will use a representative input noise source and consider all the circuits as noiseless. S-parameter equipment will use some white noise source as a frequency-sweep input source.