Title :
Analysis of phase noise spectrum in LC oscillator based on nonlinear method
Author :
Li, ZhiPeng ; Bao, Jingfu ; Tang, Puying ; Wang, Fei
Author_Institution :
Sch. of Electron. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
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.
Keywords :
UHF oscillators; nonlinear network analysis; phase noise; ADS; Colpitts oscillator; LC oscillator; circuit electrical parameters; device noise; feedback factor; frequency 2.9 GHz; linear spectrum shaping; nonlinear method; nonlinear spectrum conversion; output phase noise spectrum analysis; resistors; steady-state oscillation; transistors; Analytical models; Circuit noise; Closed-form solution; Feedback; Noise shaping; Oscillators; Performance analysis; Phase noise; Resistors; Steady-state; LC oscillator; feedback factor; nonlinear model; phase noise; spectrum conversion;
Conference_Titel :
Microwave and Millimeter Wave Technology (ICMMT), 2010 International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-5705-2
DOI :
10.1109/ICMMT.2010.5525011
