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Frequency synthesizer developed in the aviation communication equipment

Author: LiJiChao
Tutor: YangTao；ZhouXingJian
School: University of Electronic Science and Technology
Course: Electronics and Communication Engineering
Keywords: DDS Phase-locked loop Frequency Synthesizer Loop filter Phase Noise
CLC: TN74
Type: Master's thesis
Year: 2009
Downloads: 128
Quote: 1
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Abstract


With the development of science and technology , frequency synthesizer, the core component of the aviation communications equipment . The rapid development of modern electronic technology a higher demand on the frequency synthesizer ; low phase noise , clutter suppression ability, frequency conversion time is short , low power consumption become the main trend of the frequency synthesizer technology development . Single frequency synthesizer can obtain the desired results in some indicators , but can not meet all the technical requirements . The advantages and disadvantages of various frequency synthesizer of several frequency synthesizer way together , form a complementary , which is the hybrid frequency synthesis . DDS PLL is the most widely used hybrid frequency synthesizer . The article first describes the basic principle of the phase-locked loop , the loop linearity performance analysis ; DDS principle , analysis of the advantages and disadvantages of the DDS . Combined with the characteristics of the subject , after the demonstration program , the eventual adoption of direct digital frequency synthesis (DDS) designed to generate a 72MHz to 100MHz band RF signal ; the DDS PLL program designed to generate the 1005MHz ~ 1125MHz band RF signal . The design is a direct digital frequency synthesis technology is applied to the phase-locked loop frequency synthesizer , the method of direct digital synthesis features , such as the output waveform flexible and continuous phase , frequency stability and high output high frequency resolution , frequency fast conversion speed and output low phase noise , low power consumption , small size and other characteristics and the output of the phase-locked loop bandwidth , high frequency, good quality spectrum , etc. combine organic , broadband conditions good spurious performance and phase noise . The test results indicate that the frequency synthesizer is designed to meet the system design requirements, the article Finally, some recommendations to improve the system performance .

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