Answer to Question #283313 in Electrical Engineering for MD HUMAYAN KABIR

Question

What is the MOSFET short-channel effect, what causes it, and why is it 

undesirable?

Answer 1

In MOSFET, when the channel length becomes almost equal to the depletion layer (i.e. width of source and drain junction), short circuit effect is observed. This makes the lowering of drain induced barrier and degradation of hot carrier. Thus results in increase in lateral field and in turn the channel mobility depends upon the field that results in velocity saturation and in turn current saturation.