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Old 23rd May 2013, 02:46 PM   #11
macboy is offline macboy  Canada
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Join Date: Oct 2003
Location: Ottawa, Canada
You shouldn't need to simulate the op-amp noise in spice, and in fact, I doubt you will get accurate noise numbers from a best-effort model. Your best bet is to calculate the effective noise using the input voltage and current noise specifications of the op-amp (and of what is feeding it), and the gain and bandwidth of your application. This isn't trivial to do but it isn't hard. Developing a model with accurate noise performance would be much more difficult.
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