Member level 2
When using the tsmc 65nm, I see two ordinary diffusion (OD) layers. One of them under the 'purpose' column it says 'drawing' and the other one is 'drain'. I am totally familiar with the 'drawing' one but I dunno what is the purpose of the 'drain' one. I just looked at an existing example of an nmos device and noticed that the 'drain' OD layer is used on the drain region of the transistor. I will be grateful if anyone can provide more information on that.