高速任意波形合成技术研究与设计

发布时间：2018-11-20 11:33

【摘要】：任意波形发生器是具有高集成度、高技术难度的多用途信号源，常用于基础测量，随着性能需求的提升，，今后主要向着高采样率、大带宽、高指标及多领域应用等方向发展。目前，传统的函数发生器与任意波形发生器均采用单路直接数字频率合成（DDS）作为其核心技术来产生任意波形，但是随着DAC采样频率的提高以及波形查找表和波形存储器等硬件设备速度的限制，单路DDS已经无法满足高速DAC采样时的吞吐量要求。本论文以“某型号高性能任意波形发生器”项目为依托，基于FPGA+RAM+DAC的架构，采用多路DDS并发的设计方法，利用FPGA的可重构性与并行处理特性，以资源换取速度，使得DAC与FPGA接口的吞吐量增加。首先,探讨了基于单路DDS的任意波形合成原理，然后在单路DDS波形合成的基础上，提出了多路DDS并发结构的设计思路，同时进行了理论推导，并对所提出的设计方法进行仿真。最后，对各模块的功能进行实验验证和数据分析，结果表明，本文设计的采用多路DDS并发技术是可行的,对今后任意波形合成技术的发展提供很高的实用价值。
[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.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN741

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