Integrated circuit and method of operating digitally controlled oscillator

An integrated circuit device includes a digitally controlled oscillator (DCO), two charge sharing capacitors, two charge sharing switches, two pre-charge switches, and two DACs. The DCO has a first inverter and a second inverter. A first terminal of the first charge sharing capacitor is coupled to an input terminal of the first inverter through a first charge sharing switch. The first DAC has an output terminal coupled to a first terminal of the first charge sharing capacitor through a first pre-charge switch. A first terminal of the second charge sharing capacitor is coupled to an input terminal or an output terminal of the second inverter through a second charge sharing switch. The second DAC has an output terminal coupled to the first terminal of the second charge sharing capacitor through a second pre-charge switch. The embodiment of the invention also relates to a method for operating the digitally controlled oscillator. 一种集成电路器件包括数控振荡器(DCO)、两个电荷共享电容器、两个电荷共享开关、两个预充电开关和两个DAC。DCO具有第一反相器和第二反相器。第一电荷共享电容器的第一端