基于CPLD的信號(hào)采集系統(tǒng)

電子信息工程論文編號(hào):DZXX187  論文字?jǐn)?shù):13722,頁數(shù):46

目錄

摘 要 I
Abstract II
第1章 引言 1
1.1 背景 1
1.2 研究?jī)?nèi)容 1
第2章 信號(hào)采集系統(tǒng)概述 2
2.1 信號(hào)采集系統(tǒng)的概念 2
2.1.1 信號(hào)采集系統(tǒng)的任務(wù)及目的 2
2.2 信號(hào)采集系統(tǒng)的分類 2
2.2.1 獨(dú)立式數(shù)據(jù)采集系統(tǒng) 2
2.2.2 非獨(dú)立式數(shù)據(jù)采集系統(tǒng) 3
第3章 信號(hào)采集系統(tǒng)設(shè)計(jì) 5
3.1 系統(tǒng)設(shè)計(jì)概述 5
3.2 研究?jī)?nèi)容及主要技術(shù)指標(biāo) 5
3.2.1 研究?jī)?nèi)容 5
3.2.2 主要技術(shù)指標(biāo) 5
3.3 硬件總體方案設(shè)計(jì) 6
3.3.1 硬件需求分析 6
3.3.2 硬件總體框圖 6
3.4 軟件總體方案設(shè)計(jì) 7
第4章 硬件電路設(shè)計(jì) 8
4.1 信號(hào)調(diào)理電路 8
4.1.1 信號(hào)調(diào)理簡(jiǎn)介 8
4.1.2 信號(hào)調(diào)理電路設(shè)計(jì) 8
4.2 AD采樣電路 8
4.2.1 AD轉(zhuǎn)換 8
4.2.2 AD轉(zhuǎn)換技術(shù) 9
4.2.3 AD轉(zhuǎn)換電路設(shè)計(jì) 12
4.2.4 ADS7822簡(jiǎn)介 13
4.3 CPLD控制電路 14
4.3.1 CPLD簡(jiǎn)介 14
4.3.2 CPLD控制電路設(shè)計(jì) 15
4.3.3 EPM240T100I5簡(jiǎn)介 17
第5章 軟件設(shè)計(jì) 18
5.1 VHDL簡(jiǎn)介 18
5.2 QuartusⅡ簡(jiǎn)介 18
5.3 軟件設(shè)計(jì)要求 19
5.3.1 通道選擇 19
5.3.2 AD控制 19
5.4 模塊設(shè)計(jì) 20
5.4.1 時(shí)鐘分頻 20
5.4.2 通道控制 20
5.4.3 串入并出移出AD轉(zhuǎn)換之后的12位數(shù)據(jù) 21
5.4.4 檢查是否對(duì)本板操作 21
5.4.5 編碼控制 22
5.4.6 6個(gè)偏移地址的操作控制 22
5.5 軟件仿真 26
第6章 結(jié)束語 28
致 謝 29
參考文獻(xiàn) 30
附錄 31

摘 要

 信號(hào)采集是測(cè)量和分析的必要手段。目前市場(chǎng)上的信號(hào)采集卡種類較多，功能不一，主要分為高速信號(hào)采集卡和低頻信號(hào)采集卡，大部分為針對(duì)性設(shè)計(jì)，通道數(shù)較少，適用范圍較為局限。為此，本文設(shè)計(jì)了一款且具有32個(gè)通道的模擬信號(hào)采集卡，利用CPLD實(shí)現(xiàn)采集通道控制和AD轉(zhuǎn)換，通過通道的切換可實(shí)時(shí)采集32路信號(hào)，適合較大規(guī)模的信號(hào)采集應(yīng)用。
 本文設(shè)計(jì)一種基于CPLD的信號(hào)采集系統(tǒng)。利用CPLD的資源和結(jié)構(gòu)特點(diǎn)是本設(shè)計(jì)的核心。它能實(shí)現(xiàn)信號(hào)采集與控制、信號(hào)處理、通訊及輸出控制等功能。介紹了信號(hào)采集的概念和目前各種常見的信號(hào)采集系統(tǒng)，分析了信號(hào)系統(tǒng)的工作原理。對(duì)信號(hào)采集系統(tǒng)進(jìn)行模塊化分析，其中，重點(diǎn)介紹了多通道信號(hào)采集系統(tǒng)的設(shè)計(jì)與實(shí)現(xiàn)。

關(guān)鍵詞：信號(hào)采集系統(tǒng)，CPLD，AD采樣

Abstract

 Signal acquisition is the necessary means of measurement and analysis . Currently on the market signal acquisition has many card types and different functions, mainly divided into high-speed signal acquisition card and low-frequency signal acquisition card, targeted for the majority of the design and few channels, limited scope. Therefore, this article and has designed a 32-channel analog signal acquisition card, use CPLD to achieve access control and acquisition AD conversion, the switch can access through the acquisition of 32 real-time signals, suitable for large-scale signal acquisition applications.
 In this paper, it was based on the CPLD signal acquisition system. The design of CPLD’s core is the use of the resources and structure. It can realize like signal acquisition and control, signal processing, communications and export control, and other functions and so on. It introduced the concept of signal acquisition and the current common signal acquisition system. It also analysis the signal system . The signal acquisition of modular system, which focuses on multi-channel signal acquisition system design and implementation.
 
Keywords: Signal acquisition system， CPLD, AD，Sampling