clock buffer

An inverter using very wide transistors is used as a “clock buffer” in a microprocessor to deliver a 2-GHz clock to various flipflops. Suppose the buffer drives five million transistors with an average width of 1 m. If the gate length is 0.18 µm, Cox = 10 fF=µm2 and the gate capacitance is approximated by W LCox, determine the power dissipated by the clock buffer. Neglect the crowbar current (even though it is not negligible.)