Title

利用一新式電容放大技巧之展頻時脈產生器設計與製作

Translated Titles

The Design and Implementation of Spread Spectrum Clock Generators Using a Novel Capacitance Multiplication Method

DOI

10.6342/NTU.2009.00520

Authors

郭仲宇

Key Words

電磁輻射干擾 ; 展頻時脈產生器 ; 鎖相迴路 ; 壓控震盪器 ; 迴路濾波器 ; Electromagnetic interference (EMI) ; Spread spectrum clock generator (SSCG), Phase locked loop (PLL) ; Voltage controlled oscillator (VCO) ; Low pass filter (LPF)

PublicationName

臺灣大學電子工程學研究所學位論文

Volume or Term/Year and Month of Publication

2009年

Academic Degree Category

碩士

Advisor

盧奕璋

Content Language

英文

Chinese Abstract

電子產品容易對周遭零件產生電磁輻射干擾(EMI),隨著電路操作速度越來越快,其影響越甚,展頻技術是一解決此問題的有效方法,一建構在對鎖相迴路中的壓控震盪器直接調變的機制以達到展頻效果之方法被提出,然而此方法中對迴路頻寬的要求必須遠小於調變訊號頻率,換句話說,在電路實作上,必須利用相當大的被動電容,在此論文中,亦提出一電容放大技巧來解決此問題。 第一章簡單摘要鎖相迴路,包括其線性模型,雜訊源,和各組成區塊設計時所應注意事項。 第二章主要在介紹展頻時脈產生器之基本觀念,包含基本原理,調變頻率、調變輪廓和展頻量之間的關係,以及展頻對於時脈在時域下的影響,最後摘要介紹四種電路實現的方法。 第三章介紹提出之雙迴路電容放大技巧,並與相關文獻作一整理比較。 第四章提出一展頻時脈產生器,其調變路徑直接對壓控震盪器作用達到展頻效果,此章節包含行為模擬與系統分析,所提出之架構利用TSMC 0.18μm 1P6M CMOS製程製作,量測結果並於最後呈現。 第五章實作另一操作於X-band 應用中的展頻時脈產生器,並提出一對充電汞之補償機制,以增加其電流匹配程度。

English Abstract

Electronic components often generate radiated electromagnetic interference (EMI)that affects the operations of nearby components. It becomes a serious problem that faster operating speeds result in more EMI. It has been proved that the spread spectrum clocking can reduce the peak power into a controllable range, thus achieving EMI reduction effectively. A spread spectrum clock generator (SSCG) is a phase locked loop (PLL) with appropriate frequency-modulated output. One of the implemental methods involves direct modulation of the voltage controlled oscillator (VCO) in PLL. But the loop bandwidth should be much smaller than the modulation frequency to allow frequency variation; i.e. there should be large passive components, especially capacitors as using this method. Similarly, the small bandwidth is also required for stability when a small input reference is applied to a PLL. In this thesis, a modified dual-path loop filter is presented. This configuration can have a multiplication ratio more than n. This configuration is applied to the SSCG as well. Chapter 1 gives a brief summary of the PLL, including its applications, linear model, related noise source, and issues among each block. Chapter 2 focuses on the basic properties of SSCG, different profiles on the spectrum, timing impacts within spread spectrum, and summarizes the circuit implementation methods of the SSCG. Chapter 3 provides a technique for capacitance multiplication utilized in the low pass filter (LPF). We will give a detailed description and compare the proposed one with the previous work using Simulink simulator. In chapter 4, an SSCG with direct modulation on VCO and based on the technique mentioned in chapter 3 is presented, fabricated in 0.18-μm TSMC CMOS process. The experimental results of this chip are also presented. The experimental results also confirm that different modulation profiles result in different EMI reduction. Chapter 5 implements another SSCG used for X-band application. A simple feedback compensation mechanism added in the original charge pump is presented. The sections contain the circuit descriptions of each building block and list some cautions when layout and designing. We also leave some conclusions and recommendations for future work at the end of this thesis.

Topic Category 電機資訊學院 > 電子工程學研究所
工程學 > 電機工程
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