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研究生:陳政全
研究生(外文):Cheng-Chuan Chen
論文名稱:2.4GHz無線網路中頻電路設計與測試
論文名稱(外文):2.4GHz WLAN IF Circuit Design and Test
指導教授:瞿大雄
指導教授(外文):Ta-Hsiung Chu
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:電信工程學研究所
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:2004
畢業學年度:92
語文別:英文
論文頁數:147
中文關鍵詞:無線網路電路測試佈局
外文關鍵詞:circuitWLANlayoutPCB
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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………………………...138
References

[1]Y. W. Chen, “2.4GHz WLAN RF Circuit Design and Test,” Master Thesis, National Taiwan University, June 2004.
[2]S. P. Chuang, “2.4GHz WLAN Baseband Processor and Synthesizer Circuit Design and Test,” Master Thesis, National Taiwan University, June 2004.
[3]RF Micro Devices, “RF2948B 2.4GHz Spread-Spectrum Transceiver data sheet,” June 2002.
[4]RF Micro Devices, “RF2494 High Frequency LNA/Mixer data sheet,” June 2001.
[5]RF Micro Devices, “RF5117 3V, 1.8GHz to 2.8GHz Linear Power Amplifier data sheet,” June 2001.
[6]T. Kugelstadt, “Chapter 16 – Active Filter Design Techniques,” Op Amps for Everyone, Texas Instruments, Literature number SLOD006A, September 2001.
[7]SAWTEK, “855898 374MHz SAW Filter data sheet,” January 2002.
[8]SOSHIN, “MDR742F 2.45GHz BPF for Wireless LAN & Bluetooth data sheet,” June 2002.
[9]Protel, “Design Explorer 99SE,” http://www.protel.com.
[10]M. Inamori, K. Motoyoshi, T. Kitazawa, K. Tara, and M. Hagio, “A new GaAs variable gain amplifier MMIC with a wide-dynamic-range and low-voltage-operation linear attenuation circuit,” Radio Frequency Integrated Circuits (RFIC) Symposium, pp. 39-42, June 1999.
[11]D. A. Fisher, D. M. Dobkin, “A temperature-compensated linearizing technique for MMIC attenuators utilizing GaAs MESFETs as voltage-variable resistors,” IEEE International Microwave Symposium, vol. 2, pp. 781-784, May 1990.
[12]J. Lesurf, “Amplifier currents and symmetry,” Audio Miscellany, http://www.st-and.demon.co.uk/, July 2003.
[13]Agilent Technologies, “E4438C Vector Signal Generator Documentation,” September 2002.
[14]Hewlett Packard, “HP 8360 Synthesized Sweepers User’s Handbook,” December 1992.
[15]B. Razavi, “RF Microelectronics,” Prentice-Hall, p. 21, 1998.
[16]Agilent Technologies, Advanced Design System 2002, and LINECALC, 2002.
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