Scientific Research Publishing
In this paper, the authors present a low-phase-noise LC Voltage-Controlled Oscillator (LC-VCO) with top resistive biasing in subthreshold region. The subthreshold LC-VCO has low-power and low-phase-noise due to its high trans-conductance efficiency and low gate bias condition. The top resistive biasing has more benefit with the feature of phase noise than MOS current source since it can support the low-noise characteristics and large output swing. The LC-VCO designed in 130nm CMOS process with 0.7V supply voltage achieves phase noise of -116dBc/Hz at 200kHz offset with tuning range of 398MHz to 408MHz covering Medical Implant Communication Service (MICS) band.