直接降頻可雙向工作的調變器及解調器之設計及基頻頻寬之研究

近年來隨著無線通訊產業的蓬勃發展，微波頻帶已經趨近於飽和，為了追求更寬的頻譜來達到更快傳輸速率及高資料容量的傳輸，寬頻的毫米波頻段提供了解決此問題的途徑，毫米波無線通訊系統提供了相對於微波通訊系統寬頻的優點，且為了更有效的使用頻譜，各種不同且複雜的數位調變方式及方法被發表出來，越複雜的調變方式其所需的線性度越高，且需要更多不同的相位訊號來完成調變的過程，因此高線性度及四相位的調變及解調器將是此篇論文的研究重點，為了達到高整合性，高效能，及低成本的電路設計，我門利用互補式金氧半導體(CMOS)製程來完成此電路設計，因此一小面積的直接降頻(Direct down-conversion)及直接升頻(direct up-conversion)電路將在文中介紹。近來毫米波十億位元(Gigabit)無線通訊系統是很熱門的一個話題，為了達成此傳輸速率，除了毫米波頻譜的利用是必須的之外，基頻頻譜的頻寬也扮演了很重要的角色，已發表的許多研究中，基頻頻寬(調變頻寬)多受限於1GHz以下，少數能達到1~3GHz，但相對於毫米波頻段所開放的頻帶，似乎較窄頻且有些浪費，因此提高基頻頻寬至6~7GHz，甚至10GHz以上也將於文中描述，因此基頻頻譜的頻寬也將可以大大的改善，不僅十億位元(Gigabit)的資料傳輸速率可以達到，甚至連百億位元(10Gigabit)的資料傳輸速率都有機會達成，將可解決將來對無線通訊系統速率的需求。

關鍵字

調變器；解調器；混頻器；基頻頻寬

並列摘要

In the last new years , as the demands of wireless communication system grows rapidly , the bands of microwave frequency had been saturated with various communication applications . To achieve wider spectrum for high-speed and high-capacity transmission , bands of millimeter-wave frequency are the solution of this problem . The advantage of MMW wireless communication systems is wider bandwidth comparing with microwave communication systems . To utilize the spectrum efficiently , many methods of complexly digital modulation is proposed . The more complex modulation , the higher linearity is required , and more various phase of signals are required to accomplish process of modulation . Therefore high-linearity and quadrature-phase modulator and demodulator are the emphasis of this thesis . For high level of integration , high performance and low cost , this chip is fabricated by the complementary oxide semi-conductor(CMOS) 0.13um process . A compact size of direct down-conversion and direct up conversion circuits will be presented in this thesis . Gigabit wireless communication system is a popular topic recently . Except the use of millimeter-wave spectrums , base-band bandwidth is also an important role for high-speed transmission . In many proposed papers , the base-band bandwidth is limited below 1GHz , but there are still some papers which demonstrates the base-band bandwidth of 1 to 3 GHz . It seems narrower than the unlicensed millimeter-wave bands . The method of extending base-band bandwidth to 6-7GHz or even higher than 10GHz will be demonstrated in this thesis . Therefore the bandwidth of base-band spectrum is improved . Not only data rate of gigabit per second , but also data rate of 10 gigabit per second will be achieved . It is a solution for speed of wireless communication systems .

並列關鍵字

modulator ； demodulator ； mixer ； base-band bandwidth

參考文獻

[1]Keiichi Ohata, “Developments of Gigabit Wireless Links in Japan,” 2003 Gallium Arsenide Integrated Circuit Symposium, pp. 85-88.

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[7]H. J. Siweris, A. Werthof, H. Tischer, U. Schaper, A. Schafer, L. Verweyen, T. Grave, G. Bock, M. Schlechtweg, and W. Kellner, “Low-cost GaAs pHEMT MMIC’s for millimeter-wave sensor application,” IEEE Trans. Microwave Theory and Tech., vol. 46, pp. 2560-2567, Dec. 1998.

[8]H. Shigematsu, T. Hirose, F. Brewer , M. Rodwell, “Millimeter-wave CMOS circuit design,” IEEE Trans. Microw. Theory Tech., vol. 53, no. 2, pp. 472-477, Feb. 2005.

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直接降頻可雙向工作的調變器及解調器之設計及基頻頻寬之研究

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