Amosfet 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 200ω. if the mosfet has kn’=0.4 ma/v2 and is operated at vov=0.25v, find the required w/l ratio. also specify the dc bias current id. if the amplifier load resistance varies over the range 1kω to 10kω, what is the range of av of the source follower?

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.