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研究生:姚啟平
研究生(外文):Chi-Ping Yao
論文名稱:雙頻段壓控震盪器之電路設計
論文名稱(外文):The Circuit Design of Dual-Band Voltage-Controlled Oscillator
指導教授:連振炘
指導教授(外文):Prof. Chen-Hsin Lien
學位類別:碩士
校院名稱:國立清華大學
系所名稱:電子工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:49
中文關鍵詞:壓控震盪器
外文關鍵詞:voltage -controlled oscillator
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當製程技術進步,電源供應電壓VDD也隨之下降,用來調變可變電容的偏壓也跟著下降。因此,VCO可調範圍也隨之下降。本論文在使用CMOS製程,模擬規格GSM900和DCS-1800規範的雙頻段壓控震盪器,可用於射頻接收機。所以,從電路方面(switch resonator)來提供所需的多頻段和寬頻段,並利用switch resonator來達到需要的雙頻(dual-band)範圍,並使用可變電容來做微部調整。並且藉由switch resonator來提供功率和相位雜訊的取捨。
此外VCO也可以運用在鎖相迴路(PLL)與頻率合成器(Frequency Synthesizer)方面。而特別是在頻率合成器功率與雜訊的考量,若可以使用雙頻段的VCO。在divider除頻上便可以使用VCO的高頻低頻兩個頻段來除,可以節省功率。而VCO通常是雜訊的來源,若可以將雜訊將低也是VCO設計的重點
第二章介紹一些VCO的重要規格與電感和可變電容。第三章介紹電路的原理與設計的方法並探討電路相位雜訊、功率消耗、震盪頻率,並且針對壓控振盪器的相位雜訊提出可行的預估方式。VCO方面,壓控振盪器可操作頻率範圍分別為752MHz~932MHz和1.58GHz ~ 2.14GHz,可以含蓋整個DCS1800和GSM900發射與接收的頻帶,適用於低中頻接收機設計使用。第四章則為本文的模擬結果。
整體電路使用TSMC 0.18um1p6m,並與常見架構之LC壓控震盪器比較功率消耗、相位雜訊。壓控振盪器相位雜訊以線性時變系統分析,如果配合元件雜訊量測,可得出振盪器各部份對整體雜訊貢獻的程度。
未來進一步的工作有:
(1)提高更大的雙頻範圍(2.6GHz~5.2GHz)
(2)VCO與接收機整合,搭配多相位濾波器可實現寬頻、提高震盪頻率電路。
(3)整體電路消耗功率降低之研究

When the device technology improves, the power supply vdd become lower,the voltage used to bias the varactor reduced consequently. As a result, the tuning range of vco reduces.This thesis use CMOS technology to simulate specification of GSM900 and DCS1800 which dual-band voltage-controlled oscillator,and can be used in RF transceiver.So,it introduce mulity channel and wide channel form the design of circuit.Beside, using switch resonator to meet the requirement of dual-band range and using the varactor to tune frequency slightly.

第一章 緒論.........................1
1.1 研究動機......................1
1.2 GSM900和DCS1800系統規格.......2
第二章 震盪器的規格與共振腔...........6
2.1 VCO的重要規格介紹.........6
2.2可變電容的種類.............8
2.3 電感的介紹................11
2.3.1電感的種類..............11
2.3.2電感設計考量............14
第三章 LC 壓控震盪器(Voltage-Controlled Oscillator)的原理分析
與設計..................................16
3.1 震盪器的理論...............16
3.2 VCO的基本架構..............17
3.3 LC震盪器的分析
3.3.1 功率消耗考量.... ......23
3.3.2 決定震盪頻率...........24
3.3.3 相位雜訊分析...........27
3.4 dual-band的 LC VCO設計與分析....29
3.4.1 簡介........................29
3.4.2 切換resonator的需要與分析.........29
第四章 模擬結果與討論...................32
4.1 Dual-Band VCO之設計........32
4.2 Dual-Band VCO之模擬結果.....35
第五章 結論.....................................47
參考文獻...........................................48

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