劉深淵臺灣大學：電子工程學研究所王宏旭Wang, Hung-HsuHung-HsuWang2007-11-272018-07-102007-11-272018-07-102006http://ntur.lib.ntu.edu.tw//handle/246246/57499近年來固定式數位電視(DVB-T)的接收晶片組已成為業界相當熱門的通訊產品。隨著通訊市場的需求，手提式數位電視(DVB-H)將是下個主要的研究課題。為考量手提式裝置的方便性，電池通常為其電源供應的主要方式，所以系統耗電不能太高以延長用戶使用時間。因此我們研究的主要目標為研發一個低電壓低功率消耗的類比射頻接收器前端電路，以符合手提式數位電視的需求。整個系統包括可變增益之低雜訊放大器，混頻器以及基頻可變增益放大器。 首先，我們介紹了一些關於基頻的基礎及常用的接收機架構，並決定採用直接降頻的方式來實現此接收機以及預測各電路所需之規格效能。 而後採用一雜訊抵消及增加轉導的技巧來實現可變增益之低雜訊放大器，此放大器沒有使用電感以節省面積，並且消耗較小的功率。最後實現了一個低功率的混頻器及基頻可變增益放大器，且此放大器可線性調整增益。整個接收機射頻前端電路以CMOS0.18um製程實現，在1.8伏特的供應電壓下，整個前端電路消耗功率小於40毫瓦。In the recent years, chipsets for DVB-T receivers have become hot products in the industry. According to the requirement on the market, products developed for DVB-H receivers in mobile handsets will be the next research topic. Since batteries are the main power sources of mobile handsets, the power consumption of the products is of primary concern. To achieve this goal, we develop a low-power RF front-end for DVB-H receivers in mobile handsets. The front-end consists of a variable-gain low-noise amplifier, a mixer, and a basedband variable-gain amplifier. First, we introduce the basic knowledge of RF fundamentals and some frequently used receiver architectures. The direct conversion architecture is chosen and the performance requirements of the constituent blocks are decided. A variable-gain low-noise amplifier incorporating Gm-boosting and noise-canceling techniques is designed to operate at low power consumption. Monolithic inductor is not required and the area can be greatly saved. A low power mixer and a basedband variable gain amplifier are designed for frequency downconversion and gain-adjustment, respectively. The gain can be varied linear-in-dB by using a quasi-exponential control method. The RF front-end is implemented in a 0.18μm CMOS technology and consumes less than 40mW from a 1.8V supply.Chapter 1 Introduction 1 1.1 Motivation 1 1.2 DVB-H System and Standards 2 1.3 Thesis Organization 5 Chapter 2 RF Fundamentals 7 2.1 Basic Concepts in RF Systems 7 2.1.1 S-Parameters 7 2.1.2 Stability 9 2.1.3 Noise 10 2.1.4 Sensitivity 13 2.1.5 Dynamic Range 13 2.1.6 Linearity 13 2.2 Receiver Architectures 18 2.2.1 Heterodyne Receiver 19 2.2.2 Homodyne Receiver 20 2.2.3 Low-IF Receiver 20 2.2.4 Dual-Conversion Receiver 21 2.2.5 Comparison of Receiver Architectures 22 2.3 Architecture and Specifications for DVB-H Receiver 23 2.3.1 Specifications for DVB-H 24 2.3.2 Building Circuit Block Specifications 27 Chapter 3 A Noise Canceling LNA For DVB-H Tuners 29 3.1 Introduction 29 3.2 Conventional Wideband Matching Technique 30 3.3 Noise Canceling LNA 32 3.3.1 Noise Canceling Principle 32 3.3.2 Gm Boosting Technique 34 3.3.3 A Noise Canceling LNA for DVB-H Tuners 37 3.4 Circuit Analysis 40 3.4.1 Matching 40 3.4.2 Gain Analysis 41 3.4.3 Bandwidth Analysis 42 3.4.4 Noise Analysis 43 3.5 Circuit Design 48 3.5.1 Design 48 3.5.2 Simulation Result 49 3.6 Experimental Results 52 3.6.1 Measurement Setup 52 3.6.2 Measurement Results 52 3.6.3 Layout and Die Photograph 55 3.6.4 Performance Summary 56 3.6.5 Conclusion and Discussion 57 Chapter4 A Low Power Mixer/VGA For DVB-H Tuners 59 4.1 Introduction 59 4.2 Mixer Design 59 4.2.1 Design of the RF Transconductor 60 4.2.2 Design of the LO Switching Pair 62 4.2.3 Design of the Complete Mixer 65 4.2.4 Mixer Simulation Result 67 4.3 VGA Design 68 4.3.1 VGA Circuit Topology 68 4.3.2 Offset Cancellation Loop 72 4.3.4 VGA Simulation Result 74 4.4 A RF Front-End Circuit for DVB-H Tuners 75 4.4.1 Architecture 75 4.4.2 Front-End Circuit Simulation Result 76 4.5 Experimental Results 77 4.5.1 Measurement Setup 77 4.5.2 Measurement Results 78 4.5.3 Layout and Die Photograph 80 4.5.4 Performance Summary 80 4.5.5 Conclusion and Discussion 81 Chapter5 Conclusion 83 Bibliography 856208266 bytesapplication/pdfen-US手提式數位電視射頻前端電路設計DVB-HRF front-endthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/57499/1/ntu-95-R93943075-1.pdf