Phase Noise Tutorial
Wenzel: Low-Cost Phase Noise Measurement. Quietly the best phase noise tutorial.
Here is a brief tutorial (by Alex Mott) on how to measure the phase noise of an oscillator: PhaseNoiseDocumentation.pdf
Representing Phase Noise
dphi_rms(f) [rad/rtHz] <=> 20 log(dphi_rms(f) * sqrt(2) / 2) [dBc/Hz]
dphi_rms(f) [rad/rtHz] <=> (dphi_rms(f) * f) [Hz/rtHz]
Reference
NIST Technical Note 1337 (1990), Edited by D. B. Sullivan et al.