This book describes novel and disruptive architecture and circuit design techniques, toward the realization of low-power, standard-compliant radio architectures and silicon implementation of the circuits required for a variety of leading-edge applications.  Readers will gain an understanding of the circuit level challenges that exist for low power radios, compatible with the IEEE 802.15.6 standard. The authors discuss current techniques to address some of these challenges, helping readers to understand the state-of-the-art, and to address the various, open research problems that exist with respect to realizing low power radios.