Problem 5 ( 15 points): Use the Elmore delay approximation to find the worst-case fall delay at output F for the following circuit. The gate sizes of the transistors are shown in the figure. Use the assumption that the diffusion capacitance is equal to the gate capacitance and that a minimum sized transistor has gate and diffusion capacitance equal to C. The resistance of an nMOS transistor with unit width is R. Also assume NO sharing of diffusion regions. Delay =