毕业设计（论文）-数字频率合成器的仿真研究.docVIP

摘 要 随着通信、雷达、宇航和遥控遥测技术的迅速发展，越来越需要高频率稳定度、高频谱纯度和频率范围大的频率源。然而高稳定度的晶体振荡器产生的频率往往是单一的或者只能在极小的范围内微调，而且频率通常都不是很高。目前大量采用频率合成技术，频率合成技术是将一个高稳定度和高精度的标准频率源经过加、减、乘、除的四则运算，以产生同样稳定度和精度的大量离散频率。 本文首先详细介绍了频率合成技术和锁相环的基础理论，并对数字锁相环频率合成器及其实现技术进行了深入的探讨。其次，在SystemView设计环境下对数字锁相环频率合成器进行了设计，建立了典型的直接式数字频率合成器的模型，通过调试输出了稳定的波形。最后对仿真所得到的频谱图进行了对比及分析，得出结论，达到设计要求。 关键词：锁相环；频率合成器；SystemView；仿真 Abstract With the rapid development of communication,radar,space flight and remote telemetry technology.it is imperative for a frequency source of high frequency stability,high spectral purity and a vast frequency range.However,the crystal oscillator with high stability always generates a single frequency or trimming in a very small range.At the precent day ,people mostly take the frequency synthesis technology,the adoption of frequency synthesis technology pass the high stability and high precision standard frequency source through four operations such as add,subtract,multiply and division.Meanwhile it generates a great deal of the same characteristic discrete frequencies. This article firstly introduced the basic theory of the frequency synthesis technology and phase-locked loop in detail, and discussed the digital phase-locked loop frequency synthesizer and its implementation,and confirmed the digital phase-locked loop frequency synthesizers performance in the design intensively .Secondly,the paper carried on the design of the digital phase-locked loop frequency synthesizer under the design environment of SystemView, established the typical model of direct digital frequency synthesizer,and output a stable waveform through the debugging. Finally, through the contrast and analysis of the spectrograph which obtains from the simulation ，the paper drawed the conclusion, achieved the design requirements. key words: Phase-locked loop;Frequency synthesizer;SystemView;Simulation 目录 第1章 绪论 1 1.1频率合成技术的概念及发展现状 1 1.2 锁相环的概念及发展现状 1 1.3锁相环频率合成器的发展现状 2 1.4本论文的主要工作 2 第2章 频率合成器的概述 3 2.1频率合成器及其技术指标 3 2.2频率合成器的分类 4 2.2.1直接模拟式频