【摘要】：任意波形發(fā)生器是具有高集成度、高技術(shù)難度的多用途信號源，常用于基礎測量，隨著性能需求的提升，，今后主要向著高采樣率、大帶寬、高指標及多領域應用等方向發(fā)展。 目前，傳統(tǒng)的函數(shù)發(fā)生器與任意波形發(fā)生器均采用單路直接數(shù)字頻率合成（DDS）作為其核心技術(shù)來產(chǎn)生任意波形，但是隨著DAC采樣頻率的提高以及波形查找表和波形存儲器等硬件設備速度的限制，單路DDS已經(jīng)無法滿足高速DAC采樣時的吞吐量要求。本論文以“某型號高性能任意波形發(fā)生器”項目為依托，基于FPGA+RAM+DAC的架構(gòu)，采用多路DDS并發(fā)的設計方法，利用FPGA的可重構(gòu)性與并行處理特性，以資源換取速度，使得DAC與FPGA接口的吞吐量增加。首先,探討了基于單路DDS的任意波形合成原理，然后在單路DDS波形合成的基礎上，提出了多路DDS并發(fā)結(jié)構(gòu)的設計思路，同時進行了理論推導，并對所提出的設計方法進行仿真。最后，對各模塊的功能進行實驗驗證和數(shù)據(jù)分析，結(jié)果表明，本文設計的采用多路DDS并發(fā)技術(shù)是可行的,對今后任意波形合成技術(shù)的發(fā)展提供很高的實用價值。
[Abstract]:Arbitrary waveform generator is a multi-purpose signal source with high integration and high technical difficulty, which is often used in basic measurement. With the improvement of performance requirements, it will develop towards high sampling rate, large bandwidth, high index and multi-field applications. At present, the traditional function generator and arbitrary waveform generator use single direct digital frequency synthesizer (DDS) as its core technology to generate arbitrary waveform. However, with the increase of DAC sampling frequency and the limitation of the speed of hardware devices such as waveform lookup table and waveform memory, single-channel DDS can not meet the throughput requirements of high-speed DAC sampling. In this paper, based on the project of "a certain Model of High performance arbitrary Waveform Generator", based on the framework of FPGA RAM DAC, the concurrent design method of multi-channel DDS is adopted, and the reconfiguration and parallel processing characteristics of FPGA are used to exchange resources for speed. The throughput of DAC and FPGA interface is increased. Firstly, the principle of arbitrary waveform synthesis based on single channel DDS is discussed, and then, on the basis of single channel DDS waveform synthesis, the design idea of multichannel DDS concurrency structure is proposed, and the theoretical derivation is carried out, and the design method is simulated. Finally, the function of each module is verified by experiments and data analysis. The results show that the multi-channel DDS concurrency technology is feasible, and provides a high practical value for the development of arbitrary waveform synthesis technology in the future.
【學位授予單位】：中北大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN741

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