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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27346
標題: | 應用於微波與毫米波積體電路之研究 Design of Microwave and Millimeter-wave Circuits |
作者: | Bo-Jiun Huang 黃柏鈞 |
指導教授: | 王暉 |
關鍵字: | 功率放大器,倍頻器,主動平衡不平衡轉換器, PA,doubler,active balun, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | 在本論文中,探討了一個加了線性化機制的功率放大器,及一個分佈式二倍頻器與主動平衡不平衡轉換器。在通訊系統當中,功率放大器為不可或缺的元件,功率放大器通常置於發射器的前端,用來放大射頻訊號再利用天線發射出去。因此提升功率放大器的線性度及效率成為當今設計功率放大器的重要課題。此一功率放大器採用穩懋半導體2微米砷化鎵HBT製程操作在5.8 GHz,設計時在基極端加上了線性化偏壓的機制,藉著固定偏壓的方式來達成線性化之功能;此外,本論文同時設計一個無線性化機制的功率放大器來做對照。依據量測結果所示,有線性化的功率放大器可比無線性化的功率放大器多出6 dB的輸出功率1 dB壓縮點(P1dB),並可將功率附加效率由30% 改善至40%。
本論文中的另一主題為一分佈式平衡二倍頻器;在毫米波頻段,高頻的振盪訊號並不易實現,因此藉由壓控振盪器串接倍頻器的方式,可以容易實現低雜訊的高頻振盪訊號。由於目前可參考的文獻中,CMOS製程的寬頻的倍頻器較為少見。因此本電路利用台積電CMOS 0.13微米製程,成功實現一輸出頻率在40-76 GHz之二倍頻器,同時在設計中亦加上了反射器來改善轉換損耗。 此外,本論文亦使用台積電CMOS 0.13微米製程設計出2-40 GHz的主動平衡不平衡轉換器。此電路採用兩級差動對架構,利用前取得相位差180度的訊號,再利用後級補償兩輸出端的增益差,並在電流鏡下方加入立體電感,增加差動對共源級點到地的阻抗,因此可改善整體的增益差與相位差,這是目前參考文獻當中最寬頻的設計。 A linearized power amplifier, a balanced distributed doubler, and an active balun are presented in this thesis. Power amplifiers are key components in the communication system, and they are usually put in the front-end of the transmitter to enlarge the RF signal, which is transmitted by the antenna. Therefore, to improve the linearity and efficiency of the power amplifier becomes important considerations. In this thesis, we present a 5.8GHz power amplifier with the linearizer in WIN 2-μm GaAs HBT Process. In the mean while, a power amplifier without the linearizer is designed to be compared. The measurement results show that the linearized power amplifier can improve output P1dB about 6 dB. In millimeter-wave (MMW) frequencies, there are difficulties to implement fundamental frequency oscillators. Higher frequency sources can be obtained more easily by using low frequency oscillator cascaded with the doubler. However, few broadband doublers are reported in CMOS process up to now. In this thesis, a balanced distributed doubler is fabricated using TSMC 0.13-μm process. Based on the distributed and balanced structure, the doubler features a broadband width and a good fundamental rejection. Besides, reflectors added to the input terminations are also used to reduce the conversion loss of the doubler. A 2-40 GHz active balun was also designed in TSMC 0.13-μm process in this thesis. Using two-stage differential pairs structure, it achieves broadband performance. The first stage of the active balun was used to generate out-phase signals, and then the second stage of the active balun was used to compensate the magnitude imbalance. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/27346 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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