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Ultra-WideBand (UWB) technologies are widely accepted as the center piece of ubiquitous wireless interconnects for next generation Wireless Personal Area Net-works (WPAN). It finds potential exciting applications in high-connectivity and high-interoperability multimedia consumer products within personal operating space, such as wireless home video distributions systems, and high-speed, high-mobility cable replacement solutions, such as Wireless Universal Serial Bus (W-USB) and wireless IEEE-1394 Firewire. Many active academic and industrial works have been dedi-cated to the implementation of UWB transceivers, however, a monolithic UWB radio expanding across full 3.1–10.6 GHz UWB spectrum is yet to be accomplished. Targeting Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) UWB, one of the two major competing industrial UWB standards, this dissertation focuses on system and circuit co-design of a fully integrated CMOS direct-conversion transceiver, with emphasis on architectural issue, frequency planning, and circuit topologies of its RF front-end and frequency synthesizer