This book is for RF Engineers and, in particular, those engineers focusing mostly on RF systems and RFIC design. The author develops systematic methods for RF systems design, complete with a comprehensive set of design formulas. This comprehensive reference work covers a wide range of topics from general principles of communication theory, as it applies to digital radio designs to specific examples on implementing multimode mobile systems. It provides in-depth treatment of both theoretical and practical aspects of mobile station RF system design and offers approaches for specifying RF ASICs on which mobile systems are built. In addition there is coverage of superheterodyne, direct-conversion, low-IF, and band-pass sampling radio architectures.