<P> A common use of the FET is as an amplifier . For example, due to its large input resistance and low output resistance, it is effective as a buffer in common - drain (source follower) configuration . </P> <P> IGBTs are used in switching internal combustion engine ignition coils, where fast switching and voltage blocking capabilities are important . </P> <P> Source - gated transistors are more robust to manufacturing and environmental issues in large - area electronics such as display screens, but are slower in operation than FETs . </P>

What is the distance between source and drain