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Low phase noise Ku-band frequency synthesizer

Author: ZhouHongLei
Tutor: CaiJingYe
School: University of Electronic Science and Technology
Course: Signal and Information Processing
Keywords: PLL DDS Phase Noise Frequency synthesizer
CLC: TN74
Type: Master's thesis
Year: 2008
Downloads: 176
Quote: 6
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Abstract


The frequency synthesizer is an important part of modern communication systems , has been widely used in various fields of radio communications and electronic systems . With the rapid development of various technologies , increasing frequency synthesizer phase noise , frequency resolution , conversion time and spectral purity indicators . Microwave has a shorter wavelength , wide bandwidth, as well as interaction with the atmosphere , has been widely used in the field of guidance, electronic warfare, and microwave communication . The issue is the development of a low phase noise microwave band frequency synthesizer . Firstly the basic principle of the direct digital frequency synthesis (DDS) technology and the PLL frequency synthesizer (PLL) , characteristics and phase noise characteristics are analyzed in detail . Then describes the main structure of the frequency synthesizer , including indirect frequency synthesizer (i.e. PLL synthesis technique ) and mixed - structure . From the point of view of the phase noise and spurious analysis of the advantages and disadvantages of these frequency synthesizer program . After the analysis and comparison of the advantages and disadvantages of several frequency extension technology , this article uses the the exocyclic mixer DDS PLL program to complete the design . The method of the high frequency resolution of the DDS , the characteristics of frequency agile PLL broadband spectral quality advantages organic combination , not only reduces the realization of the difficulty of the frequency synthesizer spectral purity ( phase noise and spurious level ) higher overall performance and the inverter time critical technical indicators . The selection of the excellent performance of the DDS and PLL chip in the basis of the above analysis , combined with the technical specifications of the system requirements , and the eventual adoption of DDS PLL mixing frequency synthesizer technology , to achieve a low phase noise frequency synthesizer . A major component of the circuit unit after analysis , explained in detail on important technology and circuit unit should be noted that in the debugging process and debug . The test results show that : the frequency synthesizer phase noise of water in the Ku-band range is better than average -95dBC/Hz @ 1KHz, the system maximum conversion time of less than 15us , incentives end less than - 55dBc spurious level receiving end of stray at -60dBc, the minimum step 5MHz bandwidth of 400MHz, comprehensive index to meet the system 's requirements .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Frequency synthesizer technology,frequency synthesizer
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