Ken Kundert
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As far as I know nobody has been able to analytically do the analysis for flicker noise, and I have not seen experimental results, but it is certainly my expectation that at low frequencies Sv will be flat. Remember that the amplitude of Sv is constrained by the amplitude of the signal. In particular, Sv cannot be proportional to 1/df for small df because the integral of 1/df from 0 to anything is infinity.
If it were me, I would assume that Sv for an oscillator with flicker noise has 3 regions: ~df -2 for large df (white noise region) ~df -3 for moderate df (flicker noise region) ~1 for small df (within the linewidth) And I would determine the linewidth by letting it be a parameter, and then integrating over all three regions. I would then find the value of linewidth that results in the total area equaling the noisefree power of the signal.
-Ken
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