I. Introduction
Over the last decades advancements in CMOS technology not only reduced the feature size of transistors, reducing chip area and thus saving costs, but also gave rise to fully integrated system solutions and increased the range of applications of integrated circuits. This led to an immense growth of devices that use wireless data transmission. They have entered our everyday lives in the form of mobile phones, smart phones, tablet PCs, only to mention a few, with ever growing requirements regarding their performance [1].