How to Model the Near‐to‐the‐Carrier Regime and the Lower Knee Frequency of Real RF Oscillators

<jats:p>Numerous empirical data demonstrate that real noisy RF oscillators are affected by power‐law phase noise. However, until recently, the robust analytic modeling of the deep‐into‐the‐carrier spectral regime of RF oscillators was intangible due to the infinities involved in the relevant power‐law regions. In this letter we demonstrate how recent advances in oscillator spectral modeling can be applied to extrapolate the near‐to‐the‐carrier regime as well as estimate the oscillator lower knee frequency of transition between the deep‐into‐the‐carrier regime and the power‐law regions of real RF oscillators.</jats:p>