臺灣博碩士論文加值系統

本論文中，我們探討如何藉由犧牲增益的平坦性來增加超寬頻（3.1GHz – 10.6GHz）低雜訊放大器的其他效能；尤其是降低雜訊。為了消除雜訊與寬頻輸入的阻抗匹配，我們採用Liao及Liu所提出之共閘級與共源級所組成的回授電路，做為其輸入級。而後使用共汲級電路做為其輸出級，以達到增益和輸出的阻抗匹配。我們使用SPECTRE來模擬其輸入反射損失、隔離度、功率增益、輸出反射損失、 雜訊指數、1dB壓縮點及IIP3的效能。而此一設計電路在3.1 GHz - 10.6 GHz 的頻率範圍內，其輸出及輸入的反射係數均小於-10dB（S11及S22 < -10dB），功率增益為8.2 dB到11.5dB，而雜訊指數為3.3dB到3.8dB。在1.8V電源供應下, 總功率消耗約25mW。此外，我們可調整增益級的偏壓電流，以便容納超寬頻低雜訊放大器在各種超寬頻無線傳輸系統所需的不同的連結預算。最後的硬體實現是使用台積電0.18-μm 1P6M CMOS 製程；其晶片大小為 1.017×0.98 mm2 。

In this thesis, we discuss the trade-off between gain flatness and other performance parameters (especially noise figure) in an ultra wideband (3.1GHz - 10.6GHz) LNA design. In order to eliminate the noise and to achieve the broadband input impedance matching, we used common-gate and common-source stages feedback loop circuit proposed by Liao and Liu as the input stage of this work. To achieve the desired gain and output matching, a source follower stage is used as the output stage. The UWB LNA is demonstrated by the performances of the input return loss, isolation, power gain, output return loss, noise figure, and 1dB compression with the SPECTRE simulation. Its output and the input reflection coefficients are smaller than -10dB (S11 and S22 < -10dB), the power gain is 8.2-11.5dB, and noise figure is 3.3-3.8dB in the frequency range of 3.1-10.6 GHz for this design. With 1.8-V power supply, the total power consumption is about 25mW. A gain control mechanism is also introduced by varying the biasing current of the gain stage without influencing the other figures of merit of the circuit so as to accommodate the UWB LNA in various UWB wireless transmission systems with different link budgets. Final, the circuit will be implemented with TSMC 0.18- μm CMOS 1P6M process. The chip size is 1.017*0.98 mm2.

中文摘要 i
ABSTRACT ii
致謝 iii
CONTENTS iv
LIST OF FIGURES vii
LIST OF TABLES xi
CHAPTER 1 INTRODUCTION 10
1.1 Technology Trends 10
1.2 Motivation 11
1.3 Organization 12
CHAPTER 2 OVERVIEW OF ULTRA-WIDEBAND SYSTEM 13
2.1 Brief history of Ultra-Wideband 13
2.2 Ultra Wide Band Radio to Existing Wireless System 15
2.3 The main Systems for UWB 17
2.3.1 DS-CDMA systems 18
2.3.2 MB-OFDM systems 20
2.4 The consideration of RF front-end for MB-OFDM systems 24
2.4.1 The transceiver requirements 25
CHAPTER 3 A MODIFIED ULTRA WIDE BAND NOISE CANCELING LNA 27
3.1 The common existing wideband matching techniques 28
3.2 A UWB noise-canceling LNA 30
3.2.1 Input matching 32
3.2.2 Gain analysis 33
3.2.3 Noise analysis 34
3.2.4 ADS simulation results 39
3.3 A modified noise-noise cancellation UWB Common-Gate LNA 46
3.3.1 Pre-simulation results 47
3.4 Layout 55
3.4.1 Post-simulation results 57
CHAPTER 4 CONCULSION AND FUTURE WORK 65
4.1 Conculsion 65
4.2 Future work 67
REFERENCES 68

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