基于FPGA的信号发生器设计
DDS所产生的信号具有频率分辨率高、频率合成范围宽、相位噪声低、频率转换速度快、频率切换时相位连续等优点。
本论文介绍了DDS技术的发展，并详细介绍了DDS技术的原理和结构。基于FPGA完成了正弦波和方波信号发生器的设计。能够进行输出波形的选择，实现了频率、幅度、方波波形占空比的可调。完成了软硬件的设计和具体电路的实现。实验结果表明，性能指标均达到了设计要求。8627
关键词 信号发生器 直接数字频率合成技术 FPGA
毕业设计说明书（论文）外文摘要
Title Design of The Signal Generator Based on FPGA
Abstract
The signal generator is widely used in electronic measurement and scientific experiments as common source. With the rapid development of modern electronic technology, need more precision and the frequency tunable source. With the development of large-scale programmable logic device FPGA and direct digital frequency synthesis (DDS) techniques become more sophisticated, the design and implementation of the new generation of signal generator to provide a theoretical basis and technical support.
The signal generated by the DDS technology with high frequency resolution, a wide range of frequency synthesizer with low phase noise, frequency conversion speed, phase-continuous frequency switching, etc..
This article describes the development of DDS technology, as well as details of the principles and structure of the DDS technology. FPGA-based completion of a sine wave and square wave signal generator. The choice of the output waveform, frequency, amplitude square wave duty cycle adjustable. Complete hardware and software design and the specific circuit implementation. The experimental results show that the performance indicators to meet the design requirements.
Keywords Signal Generator Direct Digital Frequency Synthesis FPGA
目 次
1 绪论 1
1.1 论文研究背景和意义 1
1.2 国内外研究现状 2
1.3 论文的主要工作 3
2 直接数字频率合成技术原理 3
2.1 DDS原理 3
2.2 DDS基本结构 5
3基于FPGA的DDS模块设计 6
3.1现场可编程门阵列（FPGA）简介 6
3.2 QuartusII的开发环境 8
3.3 基于FPGA信号发生器的实现 9
3.3.1 正弦相位累加模块 9
3.3.2 波形ROM设计 12
3.3.3 方波发生模块 14
3.3.4 波形选择模块 16
4信号发生器硬件电路设计 17
4.1系统硬件电路总体结构 17
4.2键盘控制模块 17
4.2.1键盘控制电路原理 18
4.2.2键盘消抖电路 20
4.3 LCD显示模块 21
4.4 D/A转换和滤波设计 22
4.5 系统软件设计思路 26
5 系统测试与结果 27
5.1 测试所用仪器 27
5.2 测试结果 28
结 论 30
致 谢 31
参 考 文 献 32
1 绪论
1.1 论文研究背景和意义