DC conditions and phase noise of Colpitts oscillator with DGMOST

Abstract

Oscillator phase noise in two different working regimes is addressed with the accent on their operating points (OPs). The first regime is a distinctly non-linear regime A, with a higher open loop gain and lower noise sensitivity. The second regime B is less non-linear, with a lower open loop gain and higher linearity level. Regime A has shown disagreement with the phase noise theory because of the high non-linearity that has resulted in OP change.