17.24 A chain of four inverters whose sizes are scaled by a factor x is used to drive a load capacitance CL = 1600 C, where C is the input capacitance of the standard inverter (which is the first in the chain). (a)Without increasing the number of inverters in the chain, find the optimum value of x that results in minimizing the overall delay tP and find the resulting value of tP in terms of the time constant CR, where R is the output resistance of the standard inverter. (b)If you are allowed to increase the number of inverters in the chain, what is the number of inverters and the value of x that result in minimizing the total path delay tP? What is the value of tP achieved? (a) x = 6.32; tp = 25.3 CR (b) n = 7; x = 2.87; tp = 20.1 CR