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折扣與優(yōu)惠:團(tuán)購(gòu)最低可5折優(yōu)惠 - 了解詳情 | 論文格式:Word格式(*.doc) | ![]() |
摘要:信號(hào)發(fā)生器又稱信號(hào)源或振蕩器,在生產(chǎn)實(shí)踐和科技領(lǐng)域有著廣泛的應(yīng)用。信號(hào)發(fā)生器是一種在科研和生產(chǎn)中經(jīng)常用到的基本波形產(chǎn)生器,用來(lái)產(chǎn)生正弦波、方波、三角波、鋸波等信號(hào)。 隨著數(shù)字集成電路、微電子技術(shù)和EDA技術(shù)的深入研究,DDS技術(shù)以其有別于其他頻率合成技術(shù)的優(yōu)越性能和特點(diǎn),成為現(xiàn)代頻率合成技術(shù)中的佼佼者。 本課題是基于直接數(shù)字頻率合成(DDS)原理,利用AT89C52單片機(jī)作為控制器件,采用AD9850型DDS器件設(shè)計(jì)一個(gè)信號(hào)發(fā)生器。該系統(tǒng)主要由控制模塊、信號(hào)模塊、顯示模塊、鍵盤輸入模塊構(gòu)成。由信號(hào)發(fā)生器的硬件設(shè)計(jì)和軟件設(shè)計(jì)參數(shù),該系統(tǒng)可輸出正弦波、方波,且頻帶較寬、頻率穩(wěn)定度高,波形良好。整個(gè)系統(tǒng)結(jié)構(gòu)緊湊,電路簡(jiǎn)單,功能強(qiáng)大,可擴(kuò)展性強(qiáng)。且該信號(hào)發(fā)生器具有強(qiáng)大的市場(chǎng)競(jìng)爭(zhēng)力,在跳頻技術(shù)、無(wú)線電通信技術(shù)方面具有比較廣闊的發(fā)展前景。 關(guān)鍵詞: 信號(hào)發(fā)生器;直接數(shù)字頻率合成;AD9850芯片;AT89C52單片機(jī)
Abstract:Signal generator, also known as source or oscillator, in the areas of production practices and technology has a wide range of signal generator, also known as source or oscillator. Signal generator is a kind often used in scientific research and production of the basic waveform generator, used to generate sine, square, triangle wave, sawtooth and other signals. As digital integrated circuits, microelectronic technology and in-depth study of EDA technology, its technology is different from other DDS frequency synthesizer technology and the superior performance characteristics of a modern frequency synthesis technology leader. On the basis of direct digital synthesis(DDS) principle, a signal generator was designed, using AT89C52 single chip machine as the control device and adopting AD9850 type DDS device. The system mainly by the control module, signal modules, modules, a keyboard input module. Hardware and software design parameters were given. The system can output sine ware, square ware with wide frequency band, high frequency stability and good waveform. The whole system compact, simple circuit, powerful, scalable and strong. The signal generator has stronger marker competitiveness, with wider development prospect in frequency modulation technology and radio communication technology fields. Key words: signal generator; direct digital synthesis; AD9850; AT89C52
信號(hào)波形發(fā)生器是一種常用的信號(hào)源,廣泛應(yīng)用與電子測(cè)量、自動(dòng)控制和工程設(shè)計(jì)等領(lǐng)域。隨著電子技術(shù)的發(fā)展,對(duì)信號(hào)源頻率的穩(wěn)定度、準(zhǔn)確度以及頻譜純度的要求越來(lái)越高。DDS(直接數(shù)字合成)技術(shù)是從相位概念出發(fā)直接合成所需要波形的一種新的頻率合成技術(shù),與傳統(tǒng)的模擬波形產(chǎn)生法相比,它具有相位變換連續(xù)、頻率轉(zhuǎn)換速度快、分辨率高、穩(wěn)定度好、相位噪聲小、便于集成、易于調(diào)整及控制靈活等多種優(yōu)點(diǎn)?;贒DS技術(shù)的信號(hào)發(fā)生器是一種新型信號(hào)源,它已成為眾多電子系統(tǒng)中不可缺少的組成部分。 本文主要介紹基于DDS的正弦波信號(hào)器的設(shè)計(jì)。該系統(tǒng)以AT89C52單片機(jī)作為控制器件,采用AD9850模塊作為信號(hào)發(fā)生器,通過(guò)鍵盤矩陣調(diào)節(jié)頻率的大小,液晶顯示器中顯示當(dāng)前頻率的數(shù)據(jù),從而通過(guò)連接示波器,在示波器上顯示波形的大小。該系統(tǒng)結(jié)構(gòu)簡(jiǎn)單,抗干擾能力強(qiáng),輸出的波形穩(wěn)定度高、波形良好。在通訊、導(dǎo)航、雷達(dá)、遙控遙測(cè)、電子對(duì)抗以及現(xiàn)代化的儀器儀表工業(yè)等領(lǐng)域廣泛使用。
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