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Digitally controlled LC oscillator (LC-DCO) design in 0.18 mum CMOS technology is presented with low phase noise and low power dissipation. Particular attention is given to achieve the wide tuning range. A varactor array is implemented using new logic, which made the significant reduction in the number of signal lines and the reduction in the size of local decoder, used to decode the input control word. This decoding scheme reduces the size of parasitic capacitance and power dissipation and provides wide tuning range of the proposed DCO.