Software Defined Radio Front Ends
During the last 10 years, the idea of Software Defined Radio (SDR) gained momentum pushed by the need of a wireless multistandard radio terminal capable of operating according to a variety of different mobile communication standards. Starting from the ideal concept of Software Radio (SR), this chapter investigates a number of architectural issues and trade-offs involved in the design of a fully integrated multistandard SDR front end. Receiver configurations such as heterodyne, zero-IF, digital low-IF, bandpass sampling, and direct RF sampling are described from the flexibility perspective. The state of the art for SDR front ends IC is given commenting different solutions proposed in the last years. An SDR front end based on a zero-IF receiver, which is the reference architecture for the rest of this book, is described in detail. To end the chapter, digital calibration techniques are shown that compensate for different analog imperfections in direct conversion transceivers.
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