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研究生:童維信
研究生(外文):Wei-Shin Tung
論文名稱:低功率5.7Ghz鏡頻拒斥混波器設計
論文名稱(外文):Low Power 5.7Ghz Image Rejection Mixer Design
指導教授:江逸群江逸群引用關係
指導教授(外文):Yi-Chyun Chiang
學位類別:碩士
校院名稱:長庚大學
系所名稱:電機工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
論文頁數:56
中文關鍵詞:混波器鏡頻拒斥混波器低功率
外文關鍵詞:mixerImage Rejection MixerIRMLow Power
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由於近年來資訊科技快速發展,人類對於傳輸大量有更強烈的需求,而擁有不受時間與環境限制優點的無線通訊系統(Wireless Communication System),便更加的蓬勃發展,如目前正在快速發展的藍芽(Bluetooth)技術。而未來人類對於資訊的即時性、穩定性,與通訊設備的可攜帶性,必定有更高的要求。因此,為了達到此一目標,必須將載波(Carrier Frequency)往更高頻推進,並有效的縮小電路面積、降低功率損耗及成本、並縮短研發過程等都是重要的發展方向。
在本論文中以微波積體電路(Microwave Integrated Circuit)的設計方式,來設計製作運用於5.7GHz無線通訊系統中的鏡頻拒斥混波器(Image Rejection Mixer),並製作於氧化鋁基板上。在射頻(Radio Frequency)耦合器(Coupler)的設計上我們採用寬頻的等效集總元件式(Lumped Element)設計方法來取代傳統用傳輸線(Transmission Line)設計的方式,這樣的設計可有效的降低電路面積,並在頻寬(Bandwidth)上得到比較好的結果,同樣地在中頻(Intermediate Frequency)耦合器上我們也採用等效集總元件式的設計方法來減少電路面積,而且,在耦合器電路設計上採用適當的高/低通(High/Low Pass)架構來提高混波器中各埠間的隔離度(Isolation),在混波器的設計上我們採用電阻性混波器(Resistive Mixer),因其低交互調變失真(Intermodulation Distortion)、低功率損耗及低雜訊的特性。利用這種混波架構結合集總元件式耦合器的設計將逹到高鏡頻拒斥、高隔離度、低功率損耗、小型化的特性。
Recently, because the information technology is growing rapidly, people have the more demand of conveying much data. So, the wireless communication system that has the advantage of being not limited by the time and space is growing more than before, for example, the growing of Bluetooth technology at present. Whereas. People will have more and more required in the real-time and stability of the information, and more portable communication equipment. For this reason, it is the important growing direction which we must to do that heightening Carrier Frequency﹑reducing the circuit size﹑cost down, and decreasing the research time.
In this thesis, we have designed and fabricated the 5.7GHz Image Rejection Mixer (IRM) by using Microwave Integrated Circuit (MIC) method and fabricated in Al2O3 substrate. In Radio Frequency (RF) coupler design, we used equivalent Lumped-Element technique to replace traditional transmission line design. It’s not only reducing the circuit size but also increasing the bandwidth respond. Similarly, in Intermediate Frequency (IF) we use the same method. It has many kinds of related architecture to design. But, in order to enhance the property of IRM’s isolation, we adopted a high pass equivalent topology to design RF coupler and low pass equivalent topology to design IF coupler. We selected the single-ended resistive mixer for IRM design because it has characteristic of low distortion, noise, and power consumption. Finally, we have obtained a well-designed image rejection mixer with low power, miniature and excellent isolation.
第一章 簡介……………………………………………………………1
第二章 混波器基本原理………………………………………………3
2.1 混波器基本原理……………………………………………3
2.2 混波器設計考量因素………………………………………5
2.3 鏡頻拒斥混波器的原理與架構……………………………8
第三章 集總式被動電路原理與架構…………………………………12
3.1 等效集總網路分析…………………………………………12
3.2集總元件……………………………………………………15
3.3 集總式耦合器………………………………………………18
3.3.1集總支線式耦合器…………………………………18
3.3.2寬頻集總支線式耦合器……………………………23
3.4集總式威金森功率分配器…………………………………31
第四章 場效電晶體之電阻性混波器…………………………………36
4.1混波架構的選擇……………………………………………36
4.2動作原理分析……………………………………………37
4.3 電路設計與模擬……………………………………………38
4.4 特性量測與討論……………………………………………42
第五章 MIC鏡頻拒斥混波器…………………………………………46
5.1鏡頻拒斥混波器電路設計與與模擬………………………46
5.2特性量測與討論……………………………………51
第六章 結論……………………………………………………………54
參考文獻………………………………………………………………55
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