This book describes the state-of-the-art in RF, analog, and mixed-signal circuit design for Software Defined Radio (SDR). It details the most important general design approaches and features several real examples from the most recent research results.Introduction.- Nanoscale CMOS Transceiver Implementation for a Software-Defined Radio Platform.- Digital RF and Digitally-Assisted RF.- Software-Defined Radio Receiver Architectire and RF-Analog Front-End Circuits.- Interference Rejection in Receivers by Frequency Translated Low-Pass Filtering and Digitally Enhanced Harmonic-Rejection Mixing.- Reconfigurable Analog Baseband Filter.- Multi-standard Data Converters.- Highly Linear and Efficient Watt-level SDR Transmitter with Power Mixer Array.