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How does a floating gate work?
The floating-gate MOSFET (FGMOS), also known as a floating-gate MOS transistor or floating-gate transistor, is a type of metal–oxide–semiconductor field-effect transistor (MOSFET) where the gate is electrically isolated, creating a floating node in direct current, and a number of secondary gates or inputs are deposited …
Where is a floating gate?
Notice that the floating gate is placed between the control gate and the channel. Therefore, when extra electrons are present (or absent) from the floating gate, their presence and thus the electric fields and forces they create modify the action of the gate voltage onto the channel.
How does charge trap work?
In a charge trapping flash, electrons are stored in a trapping layer just as they are stored in the floating gate in a standard flash memory, EEPROM, or EPROM. The key difference is that the charge trapping layer is an insulator, while the floating gate is a conductor.
What is the use of EPROM?
The Erasable Programmable Read-Only Memory (EPROM) is a data circuit that retains its memory even when power is off. Security system manufacturers use EPROMs to hold both the operating system and the program for the access control panel.
What is charge trap transistor?
Charge Trap Transistor (CTT): An Embedded Fully Logic-Compatible Multiple-Time Programmable Non-Volatile Memory Element for High- k -Metal-Gate CMOS Technologies.
How does a floating gate prevent quantum mechanical tunneling?
A floating (not electrically connected) polycrystalline gate is embedded in a SiO2 layer, which is thick enough to prevent any quantum mechanical tunneling ( Fig. 18). In order to charge the floating gate the drain voltage VD is made high enough to cause the avalanche break-down of the drain junction.
How are electrons trapped in a floating gate?
In the design, this gate is insulated all around by the oxide layer (SiO 2 ). The floating gate is interposed between the control gate and the MOSFET channel. The basic idea here is that any electrons placed on the floating gate are trapped there and, under normal conditions, will not discharge for many years.
Which is the best blocking layer for a floating gate?
Silicon oxide and alumina are common blocking layers. Silicon oxide is preferred for architectures that need a limited thermal budget or a very thin stack (e.g. wrapped-around-gate), whereas alumina is used for cells that suffer for early erase saturation.
How is the floating gate programming technology achieved?
This floating-gate programming technology is achieved through a digital interface composed of a digital switch matrix and an analog/digital converter. Digital switches control the tunneling and injection voltages, and the digital decoders in order to provide individual access to the floating-gate transistors.