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Where OUT is the name of the node where you want to measure the noise (in this case is the output noise); Vin is the name an independent voltage source (it can also be a current source) to which the input noise is referred, and the # 1 is the interval number meaning that if you set it to 1 you will get 1 noise calculation per each AC point you have; if you set it to let's say 20, you get a noise calculation every 20 points of your AC analysis.
Then, in your output file you will get (for each component) it's thermal, flicker and shot noise. So, for instance, if you have a BJT you will get thermal noise in Rb, Ibs (base current shot noise), Ibf (base current flicker noise), etc.
actually i want to know the effect of thermal, shot and flicker noise on the totaol integrated noise. Is there any way to get the total value of thermal/shot/flicker noise of all the components?
I don't think there's a trivial way of doing this, you'll have to write a script to add independently the contributions of each component to either thermal, shot or flicker noise and refer them to the output (or input). Go through the "HSPICE® Reference
Manual: Commands and Control Options" to see if maybe you can find an easier way of doing it; I couldn't find anything.
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