Floating Gate Transistor
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 property to store an electrical charge for extended periods of time even when they have no power.
Inside a floating gate MOSFET, the main components are a control gate, floating gate, and the thin oxide layer. When a floating gate MOSFET is given an electrical charge, that charge is trapped in the insulating thin oxide layer through a process known as Fowler-Nordheim tunneling.
External linksA Floating Gate Programmable MOSFET Using Standard Double-Poly CMOS ProcessHowstuffworks "How ROM Works"Floating Gate Devices: They are not just for digital memories anymore
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