The floating gate transistor is a variant of transistor that is commonly used for non-volatile storage such as flash, EPROM and EEPROM memory. Floating gate transistors are almost always floating gate MOSFETs. Floating gate MOSFETs are useful because of their ability to store an electrical charge for extended periods of time even when they have no power. Floating gate MOSFETs are composed of a normal MOSFET and one or more capacitors used to couple control voltages to the floating gate. Oxide surrounds the floating gate entirely, so charge trapped on the floating gate remains there. The charge stored on the floating gate can be modified by applying voltages to the source, drain, and control gate terminals such that the fields result in phenomena like Fowler-Nordheim tunneling and hot-electron injection.

Transistor Image

External links

• A Floating Gate Programmable MOSFET Using Standard Double-Poly CMOS Process
• Howstuffworks "How ROM Works"
• Floating Gate Devices

Transistors

Транзистор с плавающим затвором