MOSFET
How should the dimensions be changed to increase a MOSFET's drain current?
- AMake the gate width W narrower and the gate length L longer
- BDimensions do not affect drain current
- CMake the gate width W wider and the gate length L shorter
Show answer and explanation
Answer: C. Make the gate width W wider and the gate length L shorter
A MOSFET's drain current is roughly proportional to W/L (gate width ÷ gate length). A wider gate widens the current path and a shorter length shortens the distance carriers travel, so the current increases. In circuit design, W/L is chosen according to the required drive strength.