Этой идее "сто лет в обед".. Вам ли не знать, Евгений?? :) 1.
Analog Dialogue . Figure 11a-b:
«In order to understand how a filter can improve the jitter of a sinusoidal source, it can be useful to think of jitter in the frequency domain and estimate its value from a phase-noise plot.»
«Unfiltered, the generator exhibited greater than 4 ps of jitter, resulting in an SNR degradation of over 30 dB. With the crystal filter applied the calculated jitter was close to 50 fs, providing an improvement in SNR approaching data-sheet typical performance (Figure 13).».. и т.д.
2. Была ещё статья в IEEE где японцы для измерения КНИ этим способом очень чистую синусоиду получали:
Total Harmonic Distortion Measurement System ...