A noise-shifting differential Colpitts VCO

By Roberto Aparicio, Ali Hajimiri. IEEE J. Solid State Circuits, 2002

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Class-C Harmonic CMOS VCOs, With a General Result on Phase Noise (2008, result): “At any rate, from the above analysis we can draw a very important and unexpected conclusion; namely, that the class-C operation does not afford any advantage in terms of effective MOS (or tank) noise (again, if ), contrary to what has been believed to date [22], [23], [33].”
Ultra-low-Voltage high-performance CMOS VCOs using transformer feedback (2005, result): “As compared and reported in [12], the overlapping of the impulse-sensitivity function (ISF) of the Colpitts oscillator and its cyclo-stationary noise function is extremely small.”
A study of phase noise in colpitts and LC-tank CMOS oscillators (2005, methodology): “A differential CMOS Colpitts oscillator design making partial use of a numerical ISF approach was presented in [4], while an analysis leading to a mixed numerical-symbolic phase noise equation for a single-ended CMOS Colpitts oscillator was undertaken in [7], where, however, the time-variant nature ”