Title :
Remarks on Analysis, Design and Amplitude Stability of MOS Colpitts Oscillator
Author :
Filanovsky, Igor M. ; Verhoeven, Chris J M ; Reja, Mahbub
Author_Institution :
Alberta Univ., Edmonton
Abstract :
The small-signal analysis shows that the MOS Colpitts oscillator is described by a third order characteristic equation. The procedure for finding the second order approximation is defined, and the solution corresponding to this approximation is found. Then the equations for transistor transconductance describing function are analyzed, and the design procedure corresponding to the "convenient" operation point is given. The same equations are also used for the analysis of amplitude stability in this oscillator. It is shown that the amplitude self-modulation (squegging) in the considered oscillator is absent for any conducting angle of the transistor.
Keywords :
MOS analogue integrated circuits; integrated circuit design; modulation; oscillators; MOS Colpitts oscillator; amplitude self-modulation; amplitude stability; convenient operation point; design procedure; second order approximation; small-signal analysis; third order characteristic equation; transistor transconductance describing function; Analytical models; Circuit analysis; Circuit stability; Helium; Nonlinear equations; Oscillators; Radio frequency; Stability analysis; Steady-state; Transconductance; Colpitts oscillator; MOS Colpitts oscillator; self-modulation; squegging;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2007.900885
