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

Volume

54

Issue

9

fYear

2007

Firstpage

800

Lastpage

804

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;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2007.900885

Filename

4303321