Ken Kundert
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Normally, the corner frequency is so low that it is not a concern. This is because the noise is generally very small. However, if you have a very high noise oscillator or an application where you are concerned about very close in phase noise, then you should estimate the corner frequency. In addition, if you are using PXF analysis to estimate the phase modulation that results from noisy supplies or substrates, then the noise source could be large and you should always use the power in the response to determine whether you are above or below the corner.
-Ken
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