17.17 An inverter whose equivalent load capacitance C is composed of 10 fF, contributed by the inverter transistors, and 30 fF, contributed by the wiring and other external circuitry, has been found to have a propagation delay of 30 ps. By what factor must (WIL), and (WIL), be increased so as to reduce tp to 15 ps? By what factor is the inverter area increased?

Fig: 1