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This paper presents an agile switching frequency generator with a single voltage controlled oscillator (VCO) covering all the 14 bands for MB-OFDM UWB system. The proposed architecture with the group selection mixers is designed to simplify the synthesizer implementation for optimizing the system power consumption and harmonic sideband spurious suppression. This frequency generator, which consists of a series of dividers, quadrature counterbalance single sideband mixers and output buffers, achieves an agile switching lime of 7 ns and the unwanted sidebands of less than 35 dBc. The circuit occupies an active area of 1.8x1.6 mm2 in a 0.13 mum mixed mode CMOS technology. The overall system draws a current consumption of 49 mA from a 1.2 V supply.