Resistive Load 5 Example:Sketch the drain current and gm of M as a function of VIN. 李o o (a) Voo VoD VTH V Vint Vin VTH Vin (a) b gm depends on VIN,so if ViN changes by a large amount the small- signal approximation will not be valid anymore. In order to have a linear amplifier,we don't want gain to depend on parameters like gm which depend on the input signal. 03/742020/3/24 15