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Design and Implementation of a software simulation of low phase noise crystal oscillator - based

Author: FuZuo
Tutor: WangYuWen；LinYong
School: University of Electronic Science and Technology
Course: Software Engineering
Keywords: Crystal oscillator Leeson model Cole Rapids Phase Noise
CLC: TN752
Type: Master's thesis
Year: 2009
Downloads: 116
Quote: 1
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Abstract


The quartz oscillator capable of generating stable frequency signal , widely used in the oscillation frequency requirements higher clocks , military, communications and other fields . With electronic communications , radar technology , frequency synthesis technology continues to evolve , as the electronic equipment quartz crystal oscillator reference frequency source requirements facing more and more high , the development of high - stability crystal oscillator , phase noise indicators has become a quartz crystal oscillator trends , the prospects for development of low phase noise crystal oscillator is unlimited . This article analyzes the overview of the development of the crystal oscillator , and significance of research, as well as some basic crystal oscillation circuit , and shows the phase noise of the time domain and frequency domain representation of the method, the formation of many factors of the causes and effects of phase noise . Then from departure the feedback oscillator Sen model , focus Cole Rapids oscillator phase noise on MATLAB and VC mixed programming QL is a monotonically increasing function of C 2 . And from the oscillator unloaded Q value maximization the starting oscillator theory of design , and then through the phase noise simulation software - based method of harmonic balance this circuit . According to the results of the theoretical design and software simulation , design and development of a the 50MHz low noise crystal oscillator circuit . After the temperature test and phase noise test shows that this crystal oscillator frequency stability has been reached in the temperature range of -40 ~ 75 ℃ ± 0.28ppm or less , by the phase noise of the test results can be seen to deviate from the 50MHz crystal oscillator sample the carrier frequency of 100Hz , 1kHz at phase noise indicators , respectively, -120dBc/Hz _AT_ 100Hz , -150dBc/Hz at _AT_ 1KHz or more , to meet the project requirements .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Oscillation technique,the oscillator > Oscillator
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