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標題:
Baseband Analog Circuits for Software Defined Radio
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作者:
cnasic
時間:
2008-3-11 11:47 AM
標題:
Baseband Analog Circuits for Software Defined Radio
Contents
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Dedication v
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Preface xi
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Acknowledgments xv
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1. 4G MOBILE TERMINALS 1
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1.1 A Wireless-Centric World 1
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1.2 The Driving Forces Towards 4G Systems 3
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1.3 Basic Architecture For a 4G Terminal 6
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1.4 The Role of Analog Circuits 8
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1.5 Energy-Scalable Radio Front End 9
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1.6 Towards Cognitive Radios 11
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2. SOFTWARE DEFINED RADIO FRONT ENDS 13
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2.1 The Software Radio Architecture 13
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2.2 Candidate Architectures for SDR Front Ends 16
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2.2.1 Heterodyne and digital-IF receivers 17
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2.2.2 Zero-IF receivers 19
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2.2.3 Digital low-IF receivers 22
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2.2.4 Bandpass sampling receivers 24
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2.2.5 Direct RF sampling receivers 26
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2.3 SDR Front End Implementation 27
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2.3.1 LNA and input matching 29
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2.3.2 Frequency synthesizer 30
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2.3.3 Baseband signal processing 31
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2.3.4 Measurements results 31
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2.4 Digital Calibration of Analog Imperfections 33
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2.4.1 Quadrature imbalance 34
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2.4.2 DC offset 36
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2.4.3 Impact of LPF spectral behavior 36
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2.5 Conclusions 37
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3. LINK BUDGET ANALYSIS IN THE SDR ANALOG
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BASEBAND SECTION 39
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3.1 Analog Baseband Signal Processing 39
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3.2 Baseband Trade-Offs for Analog to Digital Conversion 40
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3.2.1 Number of poles for the LPF 41
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3.2.2 ADC dynamic range 42
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3.2.3 Baseband power consumption estimation 47
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3.3 Multistandard Analog Baseband Specs 48
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3.4 Multimode Low-Pass Filter 49
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3.4.1 Filter selectivity 50
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3.4.2 Filter noise and linearity 54
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3.4.3 Filter flexibility planning 56
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3.4.4 Cascade of biquadratic sections 59
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3.5 Automatic Gain Control 62
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3.6 Conclusions 65
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4. FLEXIBLE ANALOG BUILDING BLOCKS 67
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4.1 Challenges in Analog Design for Flexibility 67
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4.2 A Modular Design Approach 68
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4.3 Flexible Operational Amplifiers 70
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4.3.1 Variable current sources 70
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4.3.2 Arrays of operational amplifiers 71
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4.4 A Digital-Controlled Current Follower 75
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4.5 Flexible Passive Components 75
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4.6 Flexible Transconductors 77
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4.7 Flexible Biquadratic Sections 78
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4.7.1 The Active-Gm-RC biquad 79
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4.8 Conclusions 91
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5. IMPLEMENTATIONS OF FLEXIBLE FILTERS FOR SDR
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FRONT END 93
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5.1 State of the Art for Flexible CT Filters 93
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5.2 A Reconfigurable UMTS/WLAN Active-Gm-RC LPF 94
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5.2.1 Filter architecture 96
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5.2.2 Automatic RC calibration scheme 97
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5.2.3 Measurements results 102
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Contents ix
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5.3 LPF and VGA for SDR Front End 105
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5.3.1 LPF and VGA architectures 107
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5.3.2 Prototype measurements 111
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5.4 Conclusions 118
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Acronyms 119
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List of Figures 123
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List of Tables 129
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References 131
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Index 139
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