在無線通訊系統中，高性能切換器為射頻前端的一個重要區塊。為了可以設計出一個可以涵蓋多個頻段的切換器，本論文採用具寬頻特性的行進波架構來設計切換器，並針對行進波切換器作改良及應用。 第一章為論文的緒論。第二章介紹本論文設計切換器所採用的主要架構—行進波切換器，並利用兩種製程分別設計兩類行進波收發切換器。第一個電路使用互補式金氧半導體(CMOS)製程設計使用50歐姆四分之ㄧ波長阻抗轉換器的行進波收發切換器，其操作頻率為30到70 GHz。第二個電路使用高速電子移動率電晶體(HEMT)製程設計使用串聯電晶體的行進波收發切換器，操作頻率從直流到44 GHz。第三章利用基底給予負偏壓的技術來改良行進波收發切換器的特性，藉由理論的討論及電路的實測驗證了其確實可改善電路的插入損耗與功率處理能力特性。第四章將行進波切換器應用在雙刀雙擲切換器的設計上，並以環形架構實現，電路的操作頻段可從直流延伸至20 GHz。第五章則為論文的結論。 In a wireless communication system, a high performance switch is an important building block of RF front-end system. In order to achieve a broadband switch, a traveling-wave topology is applied to the circuit design. Also, the improvement and applications of the traveling-wave switch are included in the thesis. Introduction is given in chapter 1.The switch involved in the thesis are mainly based on the traveling-wave topology. The topology is described by two circuit designs with different processes and specifications in chapter 2: one traveling-wave T/R switch with a 50-Ω, λ/4 impedance transformer is designed using CMOS process, and the operating frequency is from 30 to 70 GHz. The other switch with a series transistor is designed using PHEMT process, and the operating frequency is from DC to 44 GHz. Furthermore, a technique of negative body bias is proposed to improve ciucuit performance in chapter 3. Based on the theory calculation and the experimental results, the insertion loss and power handling capability of the swiches are improved. In addition, a double-pole double-throw (DPDT) traveling-wave switch using a ring structurce is presented in chapter 4, and the operating frequency is from DC to 20 GHz. Finally, the conclusion is given in chapter 5.
