Abstract
This chapter overviews the main receiver architectures emphasizing their advantages with respect to a monolithic integration. Following the thread of image rejection, the direct conversion receiver is found to be the most suited candidate for the SDRX architecture. Low image rejection requirements, having always the same zero-IF, regardless of the RF frequency band, lowest power consumption due to processing signal in baseband are the main factors that open the way for building a “universal” SDRX based on the direct conversion architecture. However, there are some issues associated with zero-IF conversion. Therefore, this chapter also details the architectural changes, like the inclusion of a DC offset compensation loop and of high frequency dividers to reduce self-mixing, that need to be embedded in the direct conversion SDRX in order to facilitate its monolithic integration. Furthermore, considering the rate at which the ADC power efficiency improves, this chapter explains the natural evolution of the now classical mixer-based SDRX embedding analog baseband signal conditioning to mixer-based SDRX without analog baseband signal conditioning, and, in the near future, to mixer-less direct sampling systems.
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