臺灣博碩士論文加值系統

在本論文中，我們設計一超寬頻(3.1GHz – 10.6GHz)的射頻前端電路。所使用的製程為台積電TSMC 0.18um 1P6M CMOS製程。此射頻前端電路包含了超寬頻低雜訊放大器以及主動式降頻混波器。所設計的超寬頻低雜訊放大器核心消耗功率為11.484mW，在3.1 GHz - 10.6 GHz 的頻率範圍內，其增益大於10 dB以及雜訊指數小於3.9 dB。超寬頻低雜訊放大器的佈局面積約0.55 mm2。此超寬頻低雜訊放大器為單端的架構，因此需要一個單端轉雙端的電路 (主動式balun)，以連接到隨後為主動式雙平衡架構的降頻混波器。此超寬頻接收機之射頻前端電路參考多頻帶正交頻率多重分割技術規格草案的Mode-2要求。針對group A以及group C的頻帶做ADS的模擬，以驗證其雜訊、增益和線性度等特性。

This thesis describes the design of a UWB (3.1GHz – 10.6GHz) RF front-end circuit. The process is TSMC 0.18um 1P6M CMOS process. This RF front-end circuit consists of a UWB LNA and an active down-conversion mixer. The designed UWB LNA has a gain greater than 10 dB and the noise figure less than 3.9 dB with the power consumption of 11.484 mW in the frequency range 3.1 GHz – 10.6 GHz. The Layout of the UWB LNA is about 0.55 mm2. The UWB LNA is a single-ended architecture, and therefore a single-ended-to-differential circuit (active balun) is needed to connect to the followed down-conversion mixer with active double-balance architecture. According to the requirements of the Mode-2 of the MB-OFDM, the RF front-end circuit of the UWB receiver is demonstrated by the performances of the noise figure, gain and linearity with the ADS simulation at the bands of the group A and group C.

中文摘要 i
ABSTRACT ii
致謝 iii
CONTENTS iv
LIST OF FIGURES vi
LIST OF TABLES ix
CHAPTER 1 1
1.1 Technology trends 1
1.2 Motivation 3
1.3 Organization 6
CHAPTER 2 8
2.1 The history of Ultra-Wideband 8
2.2 FCC-allowed UWB system 9
2.2.1 The definition of UWB 9
2.2.2 Power emission 11
2.2.3 Channel capacity 12
2.2.4 Coexistence with the existing wireless systems 13
2.2.5 UWB applications 14
2.3 System consideration for UWB 15
2.3.1 DS-CDMA system 16
2.3.2 MB-OFDM system 18
2.4 The Challenges of RF front-end for both UWB systems 21
CHAPTER 3 25
3.1 Previous approaches in the design of wideband LNA 25
3.2 Design consideration for UWB LNA 26
3.2.1 Input match 28
3.2.2 Noise analysis 29
3.3 The UWB LNA design 32
3.4 Simulated Results 34
3.5 Layout 38
3.6 Conclusion 40
CHAPTER 4 42
4.1 Motivation 42
4.2 Design considerations of UWB receiver 44
4.2.1 DC-offset 44
4.2.2 Flicker noise 45
4.2.3 LO leakage and I/Q mismatch 46
4.2.4 Wideband input matching 47
4.2.5 Wideband operation with low DC power consumption 48
4.2.6 Noise figure and linearity of receiver 48
4.3 Design Consideration for mixer 50
4.3.1 Design requirements for UWB mixer 50
4.3.2 Double balanced mixer 51
4.3.3 Noise of the Gilbert-type mixer 52
4.3.4 Linearity of Gilbert-type mixer 53
4.4 The design of an UWB mixer 55
4.4.1 Simulated results of the UWB mixer 56
4.5 Design of UWB direct conversion receiver 59
4.5.1 Active balun 60
4.5.2 Simulated results of the UWB MB-OFDM receiver 62
4.6 Layout of the UWB MB-OFDM receiver 72
CHAPTER 5 73
5.1 Conclusions 73
5.2 Future work 74
APPENDIX A 76
REFERENCES 79

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