Modern 'smart' phones and other portable devices are expected to operate over different frequency bands and communication standards, while still having long battery life. This book is a valuable reference for radio system engineers facing this challenge. It describes different system- and circuit-level design aspects of modern multi-band/multi-standard (MB/MS) radios, which result in feasible design specifications for each building block of the system. Practical examples are given for transistor-level implementation of key building blocks such as wide band and reconfigurable low noise amplifiers, mixers, and baseband circuits using silicon technology.