無線通訊系統的發展趨勢，往大資料量、高資料傳輸速率及低功率消耗發展已經是無可避免的趨勢。為了達到這個目標，最近提出的超寬頻系統已經獲得許多青睞。因此，在系統裡的射頻電路方塊必須滿足此寬頻系統的設計需求，但這在電路設計方面還有許多的挑戰。
此篇論文主要針對在使用CMOS與BiCMOS技術來分別應用於窄頻與超寬頻混波器的設計。論文首先是介紹接收機與混波器的基本理論與重要的設計參數，也討論了不同接收機與混波器的優點及缺點。接著定量分析詳細的討論了混波器的操作原理及設計參數的取捨。在窄頻混波器方面，共設計兩個分別應用於5.2 GHz與2.4 GHz的混波器。在第一個窄頻混波器設計方面，藉由使用一個電壓器，可以將供應電壓降低到1.7 V，而功率消耗則可到8.24 mW。在第二個窄頻混波器，我們提出了一個主動式平衡器將差動輸出訊號結合為單一訊號。量測結果顯示出與模擬間的只有些許差異。此外，基於上述兩個混波器，我們設計了兩個超寬頻混波器，藉由使用多級LC帶通濾波器架構的輸入匹配電路，可有效的達到所需的寬頻匹配。

The trends for developing high data capacity, high data transmitting rate and low power consumption wireless communication systems are inevitable. To purpose this goal, the recent proposed ultra-wideband (UWB) standards have attracted much interest. The individual RF front-end circuit blocks in the systems are therefore needed to fulfill the wideband operation requirement, which is still a challenge.
The main focus of this work is to design various mixers based on currently available CMOS and BiCMOS technologies for both narrow-band and UWB applications. The fundamentals and important design parameters of the receivers and mixers are first introduced, and the advantages and disadvantages of different receiver structures and mixer topologies are discussed. The mixer operation principles and design trade offs are described in detail by analytical equations. Two narrow-band mixers are designed at 5.2 GHz and 2.4 GHz, respectively. By using an on-chip transformer, the supply voltage of the first narrow-band mixer can be decreased to as low as 1.7V resulting in an overall low power consumption of 8.24 mW. In the second narrow-band mixer design, a new active balun is proposed to combine the output differential signal to a single-ended one. The measurement results show a close agreement with the simulated results. In addition, two ultra-wideband mixers are designed based on the narrow-band mixers. We successfully design a multi-stage LC band-pass filter as the input matching network to achieve a perfect wideband matching in these two circuits.

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