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Analysis of phase noise spectrum in LC oscillator based on nonlinear method

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4 Author(s)
ZhiPeng Li ; Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China ; Jingfu Bao ; Puying Tang ; Fei Wang

A novel nonlinear model of LC oscillator is presented which is based on electrical parameters of circuit. In view of the operation condition of device in steady-state oscillation, we discuss the physical process that transforms device noise in transistors or resistors into phase noise by nonlinear spectrum conversion and linear spectrum shaping. A closed-form expression is derived for the output phase noise spectrum. This model is validated by simulation of a 2.9 GHz Colpitts oscillator using ADS. Theoretical analysis and simulation shows that phase noise performance in LC oscillator can be improved by diminishing the feedback factor.

Published in:

Microwave and Millimeter Wave Technology (ICMMT), 2010 International Conference on

Date of Conference:

8-11 May 2010