基于51單片機的頻率合成設(shè)計論文
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資料類別
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電子電工畢業(yè)論文(設(shè)計) |
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課程(專業(yè))
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單片機 |
關(guān)鍵詞
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直接數(shù)字頻率合成(DDS)|數(shù)字鍵控 |
適用年級
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大學(xué) |
身份要求
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普通會員 |
金 幣
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45 。金幣如何獲得?) |
文件格式
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word |
文件大小
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2002K |
發(fā)布時間
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2009-04-14 19:55:00 |
預(yù)覽文件
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無 |
下載次數(shù)
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2 |
發(fā)布人 |
lcw |
內(nèi)容簡介:
畢業(yè)論文 基于51單片機的頻率合成設(shè)計論文 共32頁,14693字
摘 要
本系統(tǒng)以51單片機為控制核心,由正弦信號發(fā)生模塊、功率放大模塊、調(diào)幅(AM)、調(diào)頻(FM)模塊、數(shù)字鍵控(ASK,PSK)模塊以及測試信號發(fā)生模塊組成。采用數(shù)控的方法控制DDS芯片AD9850產(chǎn)生0Hz-30MHz正弦信號,經(jīng)濾波、放大和功放模塊放大至6v并具有一定的驅(qū)動能力。測試信號發(fā)生模塊產(chǎn)生的1kHz正弦信號經(jīng)過調(diào)幅(AM)模塊、調(diào)頻(FM)模塊,對高頻載波進行調(diào)幅或調(diào)頻。二進制基帶序列信號送入數(shù)字鍵控模塊,產(chǎn)生二進制PSK或ASK信號,同時對ASK信號進行解調(diào),恢復(fù)出原始數(shù)字序列。
另外,本系統(tǒng)從簡單、調(diào)整方便、功能完備為出發(fā)點,基本實現(xiàn)了設(shè)計中的要求,波形輸出較穩(wěn)定,且精度較高。本設(shè)計還配備有LED顯示屏、鍵盤,提供了友好的人機交互界面。
關(guān)鍵詞:直接數(shù)字頻率合成(DDS) AD9850 鎖相環(huán) VCO 調(diào)幅 調(diào)頻 數(shù)字鍵控
ABSTRACT
This system is in the core of Micro-Processor , consist of sine signal generating module, Power amplifier, Amplitude Modulator, Frequency Modulator, ASK/PSK module and test signal generating module. The AD9850 controlled by Micro-Process in digital way to generate sine signal with the bandwidth 0Hz to 30MHz adjustable per 1Hz. After processing by LPF & power amplifier, the output signal has a peak value of move than 6V. The sine signal at 1 KHz was send to AM and FM module to modulate the high frequency carrier waveform. The binary sequential was send to the relative module to generate ASK and PSK signal. At last demodulate module demodulate the ASK signal and got the same binary sequential as set before.
In addition,the design of this system is basically satisfy the requirements of the symplification ,easy-modification and full-function..the output square wave is very stable and its precision is also very high. In order to provide a friendly user interface, the LED and remote infrared control keyboard was introduced in this system.
Key words:DDS ; AD9850; PLL; VOC; AM; FM; ASK; PSK
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