The switches in the figure A can be implemented using MOSFETs, as shown in the figure B. What are the W/L ratios of the transistors if the on-resistance of the transistor is to be less than 1 percent of the resistor 2R = 10 kΩ? Use VREF = 3.0 V. Assume that the voltage applied to the gate of the MOSFET is 5 V when b1 = 1 and 0 V when b1 = 0. For the MOSFET, VTN = 1 V, Kn = 50 μA/V2, 2φF = 0.6 V, and γ = 0.5 V. (Round the final answer to the nearest whole number.) The ratio is W/L = 221/1.
