sheldon
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I believe you are referring to the ability to control which noise sources contribute during transient noise analysis. This is provided as a tool for debugging transient noise issues.
Since you enabled 1/f noise for a device, you turned off the other contributions for that device. However, all the other devices are still contributing noise.
For example, you enabled M1 1/f noise, then the results will include the 1/f noise contribution for M1 and the all the other noise source for all the other devices in the design.
You will need to turn the other noise sources off, if you only want to see the noise from M1 1/f noise
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