Folks:

In Ken's document: Predicting the phase noise and jitter of PLL-based frequency synthesizers.

Page15, equation 27, he stated that L(df)=0.5*Sphi(df).

If L(df) is the measurement of PLL output in spectrum analyzer, isn't that the same thing as Sphi(df) called by other papers?

Where is the 0.5 coefficient coming from?
Question is simple, but really need someone help me out.

thanks,
Han

See footnote #4 at the bottom of page 13 in http://www.designers-guide.org/Analysis/PLLnoise+jitter.pdf.


-Ken