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This paper presents a wideband CMOS LC voltage controlled oscillator (VCO) with switched current source for 3.4-3.6GHz IMT-Advanced and 4.1-4.8GHz UWB applications. Reconfigurable LC tank with switch control is adopted to accomplish dual band operation and selection. The LC-VCO is fabricated in TSMC0.13μm CMOS process, and fully evaluated on wafer. Bias filters are used in this LC-VCO design to suppress reference current noise and bias line dynamic transient effects. Voltage supplied by 1.2V, the VCO consumes a current of 3mA at UWB band and 4.5mA at IMT-Advanced band. The measured VCO single sideband phase noise at 1MHz offset are -123dBc/Hz at 3.5GHz and -119dBc/Hz at 4.2GHz.