n devices will not be able to take full advantage of SDR a multimode manner providing many deployment technology. Clearly, the power issue comes from the options. need for high-performance components. High perfor- mance means ultra-linear devices. High-linearity de- vices mean low efficiency through high-standing Conclusion currents. Therefore, if the issue of how to design high linearity devices with lower power can be solved, and it As new and more complex communication standards are will, then costs too will also fall, opening the door for developed around the globe, the demand for new many other applications. So the key to continued SDR transceiver architectures will also grow. However, more development and evolution is continued device im- and more often the available capital, both financial and provement down the Moore's law curve and continued human, limits the designs that can be tackled. Fortu- interest in flexible radio architectures. Despite these nately, software radio technology is available for a select challenges, the current state of performance is more and growing group of these architectures that allow than sufficient for engineers and manufacturers to se- a single platform to leverage into many diverse designs. riously begin to investigate the possibilities of SDR as As seen here, this has many distinct advantages and is covered in this text. CHAPTER 2.3 Software defined radio References 1. J.H. Reed, Software Radio: A Modern 8. J.J. Carr, Secrets of RF Circuit Design 14. W. Kester, "High-Speed DACs and Approach to Radio Engineering, Prentice (New York: McGraw-Hill, 2001). DDS Systems," Section 6, High- Hall, Upper Saddle River, NJ, 2002. 9. B. Brannon, "Fast and Hot: Data Speed Design Techniques, www. 2. J. Mitola, III, "Software Radio- Converters for Tomorrow's Software- analog.com. Cognitive Radio," http://ourworld. Defined Radios," RF Design 25 (July 15. About CDMA and CDMA University. compuserve.com/homepages/jmitola/ 2002): 60-66. Available at: http://www.qual.comm. 3. B. Brannon, D. Efst