簡易波形發生器的設計

測控論文編號:CK125   論文字數:13574,頁數:36

目  錄

摘要.............................................................I
ABSTRACT........................................................II
目錄...........................................................III
1   緒 論........................................................1
1.1 課題背景.....................................................1
1.2 國內外波形發生器的發展現狀...................................1
 2  直接數字頻率合成技術(DDS)介紹.................................4
2.1 頻率合成技術.................................................4
    2.2 DDS 的原理和結構.............................................6
    3  系統總體設計.................................................11
3.1 片上系統設計................................................11
    3.2 D/A 轉換和濾波電路..........................................18
3.3 PC 端軟件...................................................22
 4  實驗結果.....................................................26
4.1 波形圖展示..................................................26
4.2 實驗結果評估................................................28
5  總結.........................................................29
致謝............................................................30
參考文獻........................................................31

摘     要

    各種各樣的信號是通信領域的重要組成部分，其中正弦波、余弦波、三角波、方波、鋸齒波等是較為常見的信號。在科學研究及教學實驗中，我們常常需要這幾種信號的發生裝置。為了實驗、以及研究的方便，研制一種靈活適用、功能齊全、使用方便的信號源是十分必要的。
    本設計實現了一個基于SOPC 的任意波形發生器，不僅可以合成正弦、余弦、方波、三角波和鋸齒波等常見波形，還可以通過PC 端軟件編輯任意波形數據，并下載到以Nios II嵌入式微處理器為核心的SOPC 系統上用于產生任意波形，具有控制靈活，輸出頻率穩定、準確，波形質量好和輸出頻率范圍寬等優點。

關鍵詞： 直接數字頻率合成；可編程片上系統；NIOSⅡ ；信號源；單片機

Abstract

    Various signals are an important part of correspondent area. In this area, sine wave,cosine waveforms, triangle wave ，sawtooth waveforms and square wave are common signals. In science research and teaching experiment, we often need the occurrence equipment of these signals. In order to make the experiment and research easier, to develop a suitable, full functional and easily used signals source is essential.
    This paper describes an arbitrary waveform generator ( AWG ) based on SOPC, which can not only synthesize sine waveforms, cosine waveforms, square waveforms, triangle waveforms, sawtooth waveforms and other common waveforms, but also generate arbitrary waveforms with data edited and downloaded by PC software. It has advantages of easy control, stable output frequency, high quality waveform and wide bandwidth.
   
Keywords： DDS；SOPC；NIOSⅡ ；signal source； SCM