電路設計均朝向面積縮小、低功率消耗及高傳輸速率之目標，使整個系統可以達到整合之目的，因此本論文針對縮小LC tank之面積、提升電感Q值及增加負電阻，以達到面積縮小和低功率消耗之目的。在論文中討論到振盪器之原理與架構，並且以現今最常使用之LC振盪器作為分析，如Colpitts振盪器、Inductive-Feedback振盪器及Cross-Couple振盪器。而在過去十年內，單石晶片已經逐漸成熟，並且單石電感也逐漸出現在雙載子和CMOS製程中，因此我們將以Hybrid之方式設計Colpitts振盪器及Inductive-Feedback振盪器，並且將比較Colpitts振盪器與Inductive-Feedback振盪器之優缺點，之後以CMOS製程來實現我們的電路，將電感性回授之設計方式加到交錯耦合壓控振盪電路裡，並且將其命名為電感性回授之低功率交錯耦合壓控振盪器。在模擬中得知我們所設計的電路，可以達到低功率消耗以寬調諧頻寬，並且使用center-tapped電感，使我們電路之LC tank達到縮小面積之目的。

　The circuit design is oriented to the goal of shrinking area、low power dissipation and high data transmission. Let all system components can be integrated on a chip. Hence our thesis aim at shrinking the area of LC tank、promoting the Q factor of inductor and increasing negative-resistance, so as to arrive at the target of shrinking area and low power dissipation. In our thesis, we talk about the theory and architecture of oscillator, and we will use the LC oscillator which is the most popular for analysis, like Colpitts oscillator、Inductive-Feedback oscillator and Cross-Couple oscillator. In the past ten years, the monolithic chip has gradually matured, and the monolithic inductor have gradually appeared on CMOS fabrication. Therefore we design Colpitts oscillator and Inductive-Feedback oscillator by hybrid, and compare each other about characteristics of oscillator. Then we realize our circuit which combines Cross-Couple oscillator with Inductive-Feedback by CMOS fabrication, and call it as “Low Power Cross-Couple VCO with Inductive-Feedback.” We can obtain the proposed circuit can reach low power dissipation and wider tuning range by simulation, and the LC tank of proposed circuit arrives at the goal of shrinking area by using center-tapped inductor.

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