I am trying to run a tranisent noise with a model based op-amp to try to speed up the simulation time. I have a problem where despite the fact that I choose a particular resistor as not generating noise (setting "Generate Noise?" to No ) or choosing the resistor as not contributing to noise in the Noise Contribution list of transient noise, spectre still seems to account for the noise.
I can see this issue because if I set the resistor value to zero, there is no noise. But if I choose a very large value (10Gohms for example), I can clearly see the noise voltage being generated (again with Generate Noise clearly set to No AND/OR the resistor chosen as "off" in the Noise Contribution list).
It's surprising because when you simulate a single resistor you can either turn off the noise but this seems to be overriden when simulated in the circuit.
Any idea why spectre behaves like this?