【正文】
廣泛的的電子儀器之一,幾乎所有電參量的測(cè)量都要用到信號(hào)發(fā)生器。由于其具有頻率轉(zhuǎn)換快、分辨率高、頻率合成范圍寬、相位噪聲低且相位可控制的優(yōu)點(diǎn),因此,DDS技術(shù)常用于產(chǎn)生頻率快、轉(zhuǎn)換速度快、分辨率高、相位可控的信號(hào),廣泛應(yīng)用于電子測(cè)量、調(diào)頻通信、電子對(duì)抗等領(lǐng)域。,,但限于當(dāng)時(shí)的技術(shù)和工藝水平,DDS技術(shù)僅僅在理論上進(jìn)行了一些探討,而沒(méi)有應(yīng)用到實(shí)際中去。所以要實(shí)現(xiàn)高性能的信號(hào)發(fā)生器,必須在技術(shù)手段上有新的突破。而傳統(tǒng)的信號(hào)源采用振蕩器,只能產(chǎn)生少數(shù)幾種波形,自動(dòng)化程度較低,且儀器體積大、靈活性與準(zhǔn)確度差。隨著通信技術(shù)的發(fā)展,對(duì)信號(hào)源的要求越來(lái)越高,需要的輸出頻率高達(dá)微波頻段甚至更高,頻率范圍從零Hz到幾GHz;頻率分辨率達(dá)到mHz甚至更小,相應(yīng)頻點(diǎn)數(shù)更多。信號(hào)發(fā)生器有很多種,包括正弦波信號(hào)發(fā)生器、函數(shù)信號(hào)發(fā)生器、脈沖信號(hào)發(fā)生器、掃描發(fā)生器、任意波形發(fā)生器、合成信號(hào)發(fā)生器等。 Signal generator。關(guān)鍵詞:直接數(shù)字頻率合成(DDS);信號(hào)發(fā)生器;AD9854 Based on the signal source of DDS technology designAbstractFrequency synthesizer modern electronic system is the important ponent of the electronic system as a heart, in munication, radar, navigation, radio and television, remote control telemetry, and many other areas have been widely used. In order to adapt to the modern electronic technology development and the market requirement, the research production of high performance arbitrary waveform generator very necessary, but also of great significance. Based on the signal source of DDS technology, because it can get very high frequency stability and precision, and at the same time can according to need realized all kinds of plex FM, jamming and an am function, it is developing very fast. At present our country waveform generator have not form a real industry, and in our country at present in the type of the waveform generator and performance with the same products abroad is a substantial gap, therefore stepping up to this kind of products of research appears imminent.This design by direct digital frequency synthesis chip AD9854 as the core, realized the high performance, low in noise and low stray DDS of signal generator. Use EP1C6Q240C8N type as the control unit AD9854 FPGA, MSP430F449 type single chip microputer as and PC for munications, design a kind of output frequency range of Hz to 120 MHz。雜散30dBc的信號(hào)發(fā)生器。本設(shè)計(jì)以直接數(shù)字頻率合成芯片AD9854為核心,實(shí)現(xiàn)了高性價(jià)比、低相噪和低雜散的DDS信號(hào)發(fā)生器?;贒DS技術(shù)的信號(hào)源,由于可以獲得很高的頻率穩(wěn)定度和精確度,同時(shí)可以根據(jù)需要方便地實(shí)現(xiàn)各種比較復(fù)雜的調(diào)頻、調(diào)相和調(diào)幅功能,因此發(fā)展非常迅速。 畢 業(yè) 設(shè) 計(jì)(論 文) 設(shè)計(jì)(論文)題目: 基于DDS技術(shù)的信號(hào)源設(shè)計(jì) 目 錄摘 要 IIIAbstract IV第一章 緒 論 1 1 1 DDS技術(shù)的發(fā)展 2第二章直接頻率合成技術(shù)的原理分析 3 DDS技術(shù)的原理和特點(diǎn) 3 DDS的結(jié)構(gòu)分析 3 DDS相位累加器 3 DDS的雜散分析 3 相位截?cái)嗾`差分析 3 幅度量化誤差分析 3 D/A輸出誤差分析 3第三章 信號(hào)源的整體設(shè)計(jì)分析 5 5 6 DDS芯片選取 6 AD9854芯片介紹 7 輸出頻譜分析 7 高速?gòu)?fù)雜控制實(shí)現(xiàn) 9第四章 系統(tǒng)硬件設(shè)計(jì) 10 系統(tǒng)總體設(shè)計(jì) 10 AD9854模塊硬件設(shè)計(jì) 10 FPGA控制模塊硬件設(shè)計(jì) 10第五章 系統(tǒng)軟件設(shè)計(jì) 15 15 人機(jī)交互界面 15第六章 系統(tǒng)調(diào)試與分析 19 硬件調(diào)試 19 19 雜散測(cè)試 19 23第七章總結(jié)與展望 24參考文獻(xiàn) 25附 錄 27致 謝 28基于DDS技術(shù)的信號(hào)源設(shè)計(jì)摘 要頻率合成器是現(xiàn)代電子系統(tǒng)的重要組成部分,它作為電子系統(tǒng)的“心臟”,在通信、雷達(dá)、導(dǎo)航、廣播電視、遙控遙測(cè)等許多領(lǐng)域中得到了廣泛的應(yīng)用。為了適應(yīng)現(xiàn)代電子技術(shù)的不斷發(fā)展和市場(chǎng)要求,研究制作高性能的任意波形發(fā)生器十分有必要,而且意義重大。目前我國(guó)波形發(fā)生器還沒(méi)有形成真正的產(chǎn)業(yè),并且我國(guó)目前在波形發(fā)生器的的種類(lèi)和性能都與國(guó)外同類(lèi)產(chǎn)品存在較大的差距,因此加緊對(duì)這類(lèi)產(chǎn)品的研制顯得迫在眉睫。使用EP1C6Q240C8N 型FPGA作為AD9854的控制單元,MSP430F449型單片機(jī)作為與PC進(jìn)行通信。該信號(hào)發(fā)生器具有雙路正交輸出,可完成線性調(diào)頻、相移鍵控和頻移鍵控等調(diào)制功能,具有常規(guī)信號(hào)發(fā)生器所不具備的輸出信號(hào)通信制式捷變功能,具有低功耗、高穩(wěn)定和高性價(jià)比的特點(diǎn),可作為目前數(shù)字通信設(shè)備、雷達(dá)和其他電子設(shè)備的檢測(cè)儀表和系統(tǒng)集成部件。 , stray 30 dBc signal generator. The signal generator has double road orthogonal output can be plete linear FM, phase shift keying and FSK etc modulation function with conventional s