Ken Kundert
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I am always skeptical of transient noise results. It is difficult to get accurate results because the noise signals are quite small and often overwhelmed by simulator errors. In addition, requesting information about low frequency noise, such as flicker noise, causes the simulations to run extremely slowly. Finally, their primary claimed benefit, that they can handle nonlinear noise effects, is almost never needed. Ironically, to see nonlinear noise effects in an oscillator, you have to simulate very close-in noise, which is extremely slow and largely impractical.
Pnoise analysis, on the other hand, separates the noise signals from the nonlinear transient behavior, making it much more accurate and robust if you do not need nonlinear noise effects, which as I already pointed out, you almost never do.
-Ken
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