瞿大雄臺灣大學：電信工程學研究所陳政全Chen, Cheng-ChuanCheng-ChuanChen2007-11-272018-07-052007-11-272018-07-052004http://ntur.lib.ntu.edu.tw//handle/246246/58583本論文以RFMD 2.4GHz無線網路晶片模組為基礎，並以電路之整合系統為觀點，設計、佈局、組裝及測試無線網路中頻電路，並與射頻及基頻電路整合考量。 論文第一章為序論，簡述無線網路並介紹本論文之基本電路架構及設計程序。第二、三章以RF2948 中頻收發機為主，探討電路設計所涉及的概念及電氣規格，其中包括中頻電路設計，以及直流及控制電路設計，並敘述電路設計結果。第四章為電路佈局，依照前後級信號特性、電路特性及測試考量，提出設計結果。第五章為電路測試，依照特定程序及信號獲得量測結果，以評估整體電路特性。第六章則為論文結論。This thesis describes the design, layout, assembly and test results of a WLAN IF circuit from a system point of view. The IF circuit uses RF2948 IF transceiver together with RFMD 2.4GHz wireless LAN chip set in order to fit the 802.11b requirements. Chapter 1 gives an introduction, which briefly describes wireless LAN and its basic circuit structure and design procedure. Chapters 2 and 3 present the circuit design based on RF2948 IF transceiver, and it involves the chip function and characteristics. Chapter 2 discusses the IF circuit design and Chapter 3 is for the DC and control circuit design. Chapter 4 then illustrates the circuit layout based on the designed circuits. The layout consideration includes the input and output signal characteristics, circuit characteristics and test requirements. Chapter 5 is on the circuit testing, which presents the measurement results by the specific procedures and testing signals. Finally, Chapter 6 is the conclusion.TABLE OF CONTENTS Abstract……………………………………………………………………………...i 中文摘要……………………………………………………………………………..ii Chapter 1 Introduction…………………………………………………………...1 1.1 Wireless Local Area Network (WLAN)…………………...1 1.2 Transceiver Structure………………………………………1 1.2.1 Signal Characteristics……………………...............1 1.2.2 Receiving Path……………………………………..2 1.2.3 Transmitting Path………………………………….3 1.2.4 Transceiver………………………………………...3 1.3 Design Procedure………………………………………….4 Chapter 2 IF Circuit Design……………………………………………………...9 2.1 RFMD RF2948 Function………………………………….9 2.1.1 Baseband Active Filter…………………………….9 2.1.2 IF Mixer…………………………………………..11 2.1.3 VGC Circuit……………………………………...12 2.1.4 RF Upconverter…………………………………..14 2.1.5 PA Driver…………………………………………14 2.2 RFMD RF2948 Specification…………………………….15 2.2.1 Receiving Path……………………………………15 2.2.2 Transmitting Path………………………………...15 2.3 SAW Filter and RF Filter…………………………………16 2.4 IF Circuit…………………………………………………16 Chapter 3 DC and Control Circuits Design…………..………………………..34 3.1 DC Circuit Structure……………………………...………34 3.2 Control Signals……………………………...……………35 3.2.1 Transmitting and Receiving Paths……….……….35 3.2.2 Baseband Filter…………………………………...35 3.2.3 VGC………………………………..……………..35 3.3 DC Circuit………………………………………………..36 3.4 Control Circuit…………………………………..………..36 Chapter 4 IF Circuit Layout…………………………………………………….43 4.1 Circuit Profile……………………….……………………43 4.2 Signal Line Types…………………….…………………..44 4.2.1 IF Signal Line………………….…………………44 4.2.2 Control Line………………………………..…….45 4.3 Signal and Control Interface…………………….………..45 4.3.1 Baseband I/O Socket………………………….….45 4.3.2 SAW Filter Pad…………………….……………..46 4.3.3 RF Filter Pad……………………………………..46 4.3.4 SMA Connector………………….……………….46 4.3.5 Control Socket……………………………..……..47 4.4 Placement and Trace………………………………….…..47 4.4.1 Power and Ground Planes……………….……….47 4.4.2 Component Placement……………………………48 4.4.3 Signal Line Trace…………………………………49 4.4.4 Via……….……………….……………………....50 4.5 Circuit Layout………………………………...…………..50 4.5.1 Top Layer…………………………………………50 4.5.2 Second Layer……………………………………..51 4.5.3 Third Layer……………………………………….51 4.5.4 Bottom Layer……………………………………..51 4.6 Test Circuit Layout……………………………………….51 4.6.1 TRL Circuit……………………………….………52 4.6.2 Component Circuit……………………………….52 4.6.3 T and Cross Circuits……………………………...52 Chapter 5 PCB Test……………………………………………………………...67 5.1 Test Setup………………………………………………...67 5.1.1 Test Equipments…………………………….……67 5.1.2 Testing Signal Type………………………………67 5.1.3 Power Supply Setup…………………………...…68 5.2 TRL Calibration and Passive Circuit Test………………..68 5.2.1 Setup and Procedure……………………………...68 5.2.2 TRL Calibration and Passive Components……….68 5.2.3 T and Cross Networks……………………………69 5.3 DC Circuit………………………………………………..69 5.3.1 Setup and Procedure…………………………...…69 5.3.2 Test Results……………………………….………70 5.4 Receiving Path……………………………………………71 5.4.1 Setup and Procedure……………………………...71 5.4.2 Test Parameters and Testing Signals……………..72 5.4.3 Test Results……………………………………….72 5.5 Transmitting Path : Baseband-to-IF……………………...74 5.5.1 Setup and Procedure……………………………...74 5.5.2 Test Parameters and Testing Signals………….….74 5.5.3 Test Results……………………….………………75 5.6 Transmitting Path : IF-to-RF…………….……………….75 5.6.1 Setup and Procedure………………………...……75 5.6.2 Test Parameters and Testing Signals……………..76 5.6.3 Test Results………………………….……………77 5.7 Transmitting Path : Baseband-to-RF………….………….79 5.7.1 Setup and Procedure……………………..……….79 5.7.2 Test Parameters and Testing Signals……….…….80 5.7.3 Test Results……………………………….………80 Chapter 6 Conclusion…………………………………………………………..109 References.................................................................................................................111 Appendices Ⅰ RFMD RF2948B Data Sheet……………………………113 Ⅱ SAWTEK 855898 374MHz SAW Filter Data Sheet…....130 Ⅲ SOSHIN MDR742F 2.45GHz BPF Data Sheet………...135 Ⅳ MAXIM MAX8877 Data Sheet………………………...1384612510 bytesapplication/pdfen-US無線網路電路測試佈局circuitWLANlayoutPCBthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/58583/1/ntu-93-R91942004-1.pdf