[Annotatie]: By the end of this decade, a 4G wireless terminal will be available that provides high quality multimedia, personalized services, and ubiquitous multi-standard broadband connectivity with a reasonable power consumption. In this context, a multi-band transceiver is needed that provides a high-level of programmability while keeping low design complexity and costs. Software Defined Radio (SDR) is the most promising technology to implement such a terminal as it enables multi-mode reception by tuning to any frequency band, by selecting any channel bandwidth, and by detecting any modulation. Baseband Analog Circuits for Software Defined Radio aims to describe the transition towards a Software Radio from the analog design perspective. As the original idea of a""""full-digital"""" Software Radio is far from the state-of-art, an analog front-end is still needed to achieve a feasible implementation. Most of the existent front-end architectures are explored from the flexibility point of view. A complete overview of the actual state-of-art for reconfigurable transceivers is given in detail, focusing on the challenges imposed by flexibility in analog design. As far as the design of adaptive analog circuits is concerned, specifications like bandwidth, gain, noise, resolution and linearity should be programmable. The development of circuit topologies and architectures that can be easily reconfigured while providing a near optimal power/performance trade-offs is a key challenge. In this book, we tackle this challenge mainly for baseband analog circuits, i.e. amplifiers and filters, proposing efficient solutions that provide a high level of programmability. Measurements results validate the design strategies. TOC:Dedication. Preface. Acknowledgements. 1. 4G wireless terminals. 2. Software Defined Radio-Front End. 3. Analog baseband Link Budget Analysis. 4. Flexible Analog Building Blocks. 5. Implementations of Flexible Filters. List of Figures. List of Tables. References. Index.[Inhoudsopgave]: DedicationvPrefacexiAcknowledgmentsxv1. 4G MOBILE TERMINALS11.1 A Wireless-Centric World11.2 The Driving Forces Towards 4G Systems31.3 Basic Architecture For a 4G Terminal61.4 The Role of Analog Circuits81.5 Energy-Scalable Radio Front End91.6 Towards Cognitive Radios112. SOFTWARE DEFINED RADIO FRONT ENDS132.1 The Software Radio Architecture132.2 Candidate Architectures for SDR Front Ends162.2.1 Heterodyne and digital-IF receivers172.2.2 Zero-IF receivers192.2.3 Digital low-IF receivers222.2.4 Bandpass sampling receivers242.2.5 Direct RF sampling receivers262.3 SDR Front End Implementation272.3.1 LNA and input matching292.3.2 Frequency synthesizer302.3.3 Baseband signal processing312.3.4 Measurements results312.4 Digital Calibration of Analog Imperfections332.4.1 Quadrature imbalance342.4.2 DC offset362.4.3 Impact of LPF spectral behavior362.5 Conclusions373. LINK BUDGET ANALYSIS IN THE SDR ANALOG BASEBAND SECTION393.1 Analog Baseband Signal Processing393.2 Baseband Trade-Offs for Analog to Digital Conversion403.2.1 Number of poles for the LPF413.2.2 ADC dynamic range423.2.3 Baseband power consumption estimation47
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