For the circuit in Fig.
(a) If vA is a sine wave, what is the maximum power supplied to a load of resistance R, in terms of VDD?
(b) The power loss is mostly due to the repeated charging and discharging of a capacitance C across the load. It can be shown that this switching power is given by 4fsCV2 DD. Find an expression for the power-conversion efficiency η and evaluate the value of η for the case fs = 250 kHz and C = 1000 pF.
