A MOSFET is connected in the source-follower configuration and employed as the output stage of a cascade amplifier. It is required to provide an output resistance of 200 Ω. If the MOSFET has kn′ = 0.4 mA/V and is operated at Vov = 0.25 V, find the required W/L ratio. Also specify the dc bias current ID. If the amplifier load resistance varies over the range 1 kΩ to 10 kΩ, what is the range of Gv of the source follower?