發(fā)布時間：2018-07-15 18:06

【摘要】：任意波形發(fā)生器用于產(chǎn)生各種制式的發(fā)射信號或者測試信號,在雷達(dá)、航天等領(lǐng)域具有重要的作用。傳統(tǒng)的信號發(fā)生器是基于模擬電子技術(shù)的,并且波形通常是規(guī)則的。在現(xiàn)代電子系統(tǒng)中,要求能現(xiàn)場輸出任意形式的信號,所以任意波形發(fā)生器就具有了重要的研究和應(yīng)用價值。論文將直接數(shù)字頻率合成技術(shù)、數(shù)字正交上變頻技術(shù)和高速串行數(shù)據(jù)傳輸技術(shù)結(jié)合在一起,以現(xiàn)場可編程門陣列和正交上變頻芯片AD9957為硬件基礎(chǔ),通過系統(tǒng)硬件電路設(shè)計和軟件編程,完成了任意波形發(fā)生器的設(shè)計與實(shí)現(xiàn)。首先,論文分析了DDS原理和數(shù)字正交調(diào)制原理,對DDS輸出的頻譜和相位舍入引起的雜散進(jìn)行了推導(dǎo),闡述了一種工程上容易實(shí)現(xiàn)并且性能較好的積分級聯(lián)梳狀(CIC)濾波器。基于任意波形發(fā)生器理論,深入研究了數(shù)字正交上變頻器AD9957的芯片架構(gòu)、三種工作模式以及內(nèi)部信號處理鏈路。其次,論文給出了任意波形發(fā)生器的硬件電路設(shè)計和軟件編程實(shí)現(xiàn)。在硬件設(shè)計中,完成了電源網(wǎng)絡(luò)、AD9957應(yīng)用電路以及光纖通信接口的設(shè)計。在FPGA軟件編程中,完成了AD9957功能配置模塊和光纖通信模塊的設(shè)計,并對QDUC模式下,基帶數(shù)據(jù)接收處理的方法進(jìn)行了詳細(xì)的說明。最后,論文給出了系統(tǒng)的調(diào)試結(jié)果,包括光纖通信測試和AD9957的調(diào)試。在光纖通信調(diào)試中,驗(yàn)證了光纖收發(fā)數(shù)據(jù)的功能并對數(shù)據(jù)誤碼進(jìn)行了測試。在AD9957的測試中,對其單音模式、插值DAC模式以及QDUC模式都進(jìn)行了調(diào)試,給出了正弦信號、線性調(diào)頻信號和調(diào)幅信號的波形測試圖和頻譜測試圖,計算了實(shí)際輸出信號與設(shè)定信號的誤差,測試結(jié)果表明該任意波形發(fā)生器具有輸出信號頻率高、誤差小、信號更新快等特點(diǎn)。
[Abstract]:Arbitrary waveform generator is used to generate various transmission signals or test signals, which plays an important role in radar, aerospace and other fields. Traditional signal generators are based on analog electronics, and waveforms are usually regular. In modern electronic system, it is required to output any form of signal in the field, so arbitrary waveform generator has important research and application value. This paper combines direct digital frequency synthesis technology, digital orthogonal up-conversion technology and high-speed serial data transmission technology, and takes field programmable gate array and orthogonal up-conversion chip AD9957 as the hardware foundation. Through the system hardware circuit design and software programming, the design and implementation of arbitrary waveform generator are completed. Firstly, the principle of DDS and the principle of digital quadrature modulation are analyzed, the spurious caused by frequency spectrum and phase rounding of DDS output is deduced, and a kind of integrated cascaded comb (CIC) filter which is easy to realize in engineering and has better performance is described. Based on the theory of arbitrary waveform generator, the chip architecture, three working modes and internal signal processing link of AD9957 digital quadrature upconverter are studied. Secondly, the paper gives the hardware circuit design and software programming of arbitrary waveform generator. In the hardware design, the application circuit of power network AD9957 and the optical fiber communication interface are designed. In the FPGA software programming, the AD9957 function configuration module and the optical fiber communication module are designed, and the method of receiving and processing the baseband data in QDuc mode is explained in detail. Finally, the debugging results of the system are given, including optical fiber communication test and AD9957 debugging. In the debugging of optical fiber communication, the function of receiving and sending data in optical fiber is verified and the error code of data is tested. In the test of AD9957, the single tone mode, interpolation DAC mode and QDuc mode are all debugged, and the waveform test diagram and spectrum test diagram of sinusoidal signal, linear frequency modulation signal and amplitude modulation signal are given. The error between the actual output signal and the set signal is calculated. The test results show that the arbitrary waveform generator has the characteristics of high output signal frequency, small error and fast signal updating.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN741

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本文編號：2124923