1/f fractional frequency noise in crystal oscillators

In the present contribution we shall first recall the problem with the proportionality of the phase power spectral density (PSD) in crystal oscillators in respect to unloaded quality factor Q of the resonators. That reverts to the basic noise theory of the oscillators and concludes with some practical testing which points to the proportionality Q/sup -2/ of the S/sub y/(f) in the flicker noise region.