Chapter 5

Digital Fractional-N Frequency Synthesis

Salvatore Levantino and Carlo Samori,    Politecnico di Milano, Italy

Introduction

One of the significant trends in microelectronics research, started during last decade, is the effort to improve the performance of analog circuits exploiting digital circuits. In most of the situations, digital circuits are employed for the calibration and the correction of analog impairments, while, in some special cases, they may even replace their analog counterparts. The motivation behind this tendency is, at least, twofold. On one side, nanoscaled CMOS technologies enable powerful digital signal processing both at low cost and reduced area occupation. On the other side, achieving high performance in analog ...

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