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Research and design of the X-band high-resolution frequency synthesizer

Author: LiaoLiangBing
Tutor: ZhangHongYu；XiaoShiWei
School: University of Electronic Science and Technology
Course: Circuits and Systems
Keywords: DDS PLL Frequency synthesizer Frequency resolution Phase Noise
CLC: TN74
Type: Master's thesis
Year: 2010
Downloads: 106
Quote: 0
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Abstract


In microwave system applied research, the X-band is important band. On the radar, X-band for remote tracking, guidance, mapping, airborne attack; addition, X-band satellite communications, military defense, and other electronic devices in a wide range of applications. Therefore, the study of the X-band frequency synthesizer technology is of great significance. With the rapid development of wireless communication technology, electronic systems increasing frequency source, high frequency resolution, low phase noise and spurious small, high frequency stability and frequency conversion time is shorter frequency synthesizer technology research direction. PLL (phase locked loop) and DDS (direct digital synthesis) frequency synthesis technology. PLL frequency synthesizer phase noise at high frequency resolution is poor, but it was spurious rejection performance of high frequency output; direct digital frequency synthesis has the advantages of high resolution, low phase noise frequency, but the output frequency is low , a large stray. DDS PLL combination of frequency synthesis technology has both the advantages of both, become an important frequency synthesizer technology. This topic is the X-band high-resolution frequency synthesizer, the requirements of the main technical indicators: output frequency of 9.5 ~~ 10GHz; frequency resolution of 100Hz; phase noise of -75 dBc / Hz _AT_ 1kHz -85 dBc / Hz _AT_ 10kH z; less than-50dBc spurious; output power greater than 10dBm; frequency stability of ± 0.05ppm. Details the basic structure and working principle of the phase-locked loop and direct digital frequency synthesis, summarizes the DDS spurious sources, including the phase truncation, amplitude quantization and DAC conversion error. Systematic summary and analysis of the realization of the frequency synthesizer technology, combined with the technical requirements of the system to determine the specific implementations of the X-band frequency synthesizer DDS incentive PLL. Completed the design of the frequency synthesizer, including refinement of indicators, schematic design, PIC microcontroller control program design and VB serial communication program design, selection of high-performance direct digital synthesis chip the AD9910 generates incentives PLL's signal, the frequency resolution of 0.23 Hz, variable frequency range of 95MHz ~ 100MHz, PLL DDS output signal multiplier to 9.5GHz ~ 10GHz, the purpose of high-frequency resolution, low spurious, and high output frequency. Completed the debugging and testing of the X-band high-resolution frequency synthesizer. The test results show that: reach the requirements of the technical specifications of the X-band frequency synthesizer.

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