computer science

Metal–nitride–oxide–semiconductor transistor

Metal–nitride–oxide–semiconductor transistor is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Metal–nitride–oxide–semiconductor transistor rather than just read about it. In short: The metal–nitride–oxide–semiconductor or metal–nitride–oxide–silicon (MNOS) transistor is a type of MOSFET (metal–oxide–semiconductor field-effect transistor) in which the oxide layer is replaced by a double layer of nitride and oxide. It is an alternative and supplement to the existing standard MOS technology, wherein the insulation employed is a nitride-oxide layer.

Key takeaways

Metal–nitride–oxide–semiconductor transistor belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Metal–nitride–oxide–semiconductor transistor to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Metal–nitride–oxide–semiconductor transistor from memory before moving on to harder problems.

Reference excerpt

The metal–nitride–oxide–semiconductor or metal–nitride–oxide–silicon (MNOS) transistor is a type of MOSFET (metal–oxide–semiconductor field-effect transistor) in which the oxide layer is replaced by a double layer of nitride and oxide. It is an alternative and supplement to the existing standard MOS technology, wherein the insulation employed is a nitride-oxide layer. It is used in non-volatile computer memory.

History

The first silicon dioxide transistors were developed by Frosch and Derick in 1957 at Bell Labs. In late 1967, a Sperry research team led by H.A. Richard Wegener invented the metal–nitride–oxide–semiconductor (MNOS) transistor, a type of MOSFET in which the oxide layer is replaced by a double layer of nitride and oxide. Nitride was used as a trapping layer instead of a floating gate, but its use was limited as it was considered inferior to a floating gate. Charge trap (CT) memory was introduced with MNOS devices in the late 1960s. It had a device structure and operating principles similar to floating-gate (FG) memory, but the main difference is that the charges are stored in a conducting material (typically a doped polysilicon layer) in FG memory, whereas CT memory stored charges in localized traps within a dielectric layer (typically made of silicon nitride).

See also Field-effect transistor MISFET MOSFET SONOS

References

Worked examples

Example 1 — a first encounter with Metal–nitride–oxide–semiconductor transistor

Start with the simplest possible case. Write down what Metal–nitride–oxide–semiconductor transistor claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Metal–nitride–oxide–semiconductor transistor before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Metal–nitride–oxide–semiconductor transistor ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Metal–nitride–oxide–semiconductor transistor

In research: Metal–nitride–oxide–semiconductor transistor appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Metal–nitride–oxide–semiconductor transistor in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Metal–nitride–oxide–semiconductor transistor is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computing stubs, Field-effect transistors, MOSFETs, so understanding it makes those chapters shorter.
In everyday life: Look for Metal–nitride–oxide–semiconductor transistor outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Metal–nitride–oxide–semiconductor transistor in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Metal–nitride–oxide–semiconductor transistor means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
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Frequently asked questions

What is Metal–nitride–oxide–semiconductor transistor in simple terms?

Why does Metal–nitride–oxide–semiconductor transistor matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Metal–nitride–oxide–semiconductor transistor?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Metal–nitride–oxide–semiconductor transistor.