How to determine transconductance parameter

  1. I'm having problems figuring out how to determine Kn which is the transconductance parameter of an NMOS MOSFET. For one of my problems I'm just given a graph of Id(drain current) vs Vd(drain voltage) and there are several Vgs(voltage b/w gate and source) curves on it and I'm asked to find Kn, Vtn(threshold voltage), and then the ratio of W/L (width/length).

    I know to find Vth, but I have no idea how to figure out W/L and Kn from just a graph. I guess first of all what exactly is Kn....
     
  2. jcsd
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