| Dictionary, Encyclopedia and Thesaurus - The Free Dictionary 3,920,809,167 visitors served. |
Dictionary/ thesaurus | Medical dictionary | Legal dictionary | Financial dictionary | Acronyms | Idioms | Encyclopedia | Wikipedia encyclopedia | ? |
FET |
Also found in: Dictionary/thesaurus, Medical, Acronyms, Wikipedia | 0.02 sec. |
|
|
FET: see transistor transistor, three-terminal, solid-state electronic device used for amplification and switching. It is the solid-state analog to the triode electron tube; the transistor has replaced the electron tube for virtually all common applications.
..... Click the link for more information. . FET (Field Effect Transistor) One of two major categories of transistor; the other is bipolar. FETs use a gate element that, when charged, creates an electromagnetic field that changes the conductivity of a silicon channel and turns the transistor on or off. FETs are fabricated as individually packaged discrete components as well as by the hundreds of millions on a single chip.FETs Vs. Bipolar FET-based silcon chips are easier to construct than their bipolar counterparts. FETs switch a little slower than bipolar transistors, but use less power. Once the gate terminal on an FET has been charged, no more current is needed to keep that transistor on (closed) for the duration of time required. By comparison, a bipolar transistor requires a small amount of current flowing to keep the transistor on. While the current for one transistor may be negligible, it adds up when millions are switching simultaneously. The heat dissipated on bipolar limits the total number of transistors that can be built on the chip, which is why CMOS logic (based on FETs) is used to build chips with millions of transistors. MOSFETs The most widely used and widely known FETs are MOSFETs (metal oxide semiconductor FETs), which come in NMOS (n-channel) and PMOS (p-channel) varieties. On a chip, NMOS and PMOS transistors are wired together in a complementary fashion to create CMOS logic, which is the most predominant and used in almost every electronic device today. See MOSFET and n-type silicon. There Are Many Kinds of FETs Similar to MOSFETs are JFETs (junction FETs), which use a PN junction gate rather than a poly-crystalline gate. Used for microwave communications, MESFETs (metal semiconductor FETs) are similar to JFETs, but use a Schottky metal gate and are made from gallium arsenide or indium phosphide, not silicon. Evolving from MESFETs for higher-frequency applications are HEMTs and PHEMTs (high electron mobility transistors and pseudomorphic high electron mobility transistors). HEMTs are also called MODFETs, TEGFETs and SDHTs (modulation doped FETs, two-dimensional electron gas FETs and selectively doped heterojunction transistors). Another high-frequency FET is the gallium arsenide-based CHFET (complementary heterostructure FET), which uses a complementary architecture similar to CMOS.
FET (electronics) Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
|
| Mentioned in | ? | References in periodicals archive | ? | Encyclopedia browser | ? | Full browser | ? | |||
|---|---|---|---|---|---|---|---|---|---|---|
No references found | With the development of new OC-192 and OC-768 components based on our high-speed GaAs HBT and PHEMT processes, Alpha is poised to support next-generation fiber-optic systems, high-speed enterprise networks and last-mile access technologies. INTERNATIONAL MICROWAVE SYMPOSIUM, SAN FRANCISCO -- United Monolithic Semiconductor (UMS) and Ansoft Corporation (NASDAQ:ANST) today announced the implementation of a GaAs IC design methodology for millimeter-wave frequencies utilizing on-chip electromagnetic extraction and a new Ansoft Designer(R)/Nexxim(R) RF design kit for the PH15 PHEMT process. Freescale, which already offers a portfolio of 12V GaAs Pseudomorphic High Electron Mobility Transistor (PHEMT) products, plans to continue development of high-voltage GaAs PHEMT technology that will result in higher-power GaAs devices for use in WiMAX system designs, as well as other applications between 2 GHz and 6 GHz. |
PHEMT |
Phelps County Phelps County Child Advocacy Network Phelps County Community Partnership Phelps County Regional Medical Center Phelps County, Missouri Phelps County, MO Phelps County, NE Phelps County, Nebraska Phelps Dodge Miami, Inc. Phelps Dodge Sierrita, Inc. Phelps Honey Wagon Phelps Kindergarten Readiness Scale Phelps Memorial Health Center Phelps, Anthony Phelps, Edward John Phelps, Samuel Phelps-Stokes Fund PHEM Phema Phemas Of Beijing Company PHEMC PHEMCE phemerol Phemister graft Phemister graft Phemister graft Phemister graft Phemister graft PHEMT PhenPhen Phen Phen fen Phen fen Phen phen Phen phen phen(o)- phen- phen- Phen-fen Phen-fen Phen-fen Phen-phen Phen-phen phenacaine phenacaine phenacaine hydrochloride Phenacemide Phenacemide phenacetin phenacetin phenacetin phenacetin, caffeine aspirin phenacetin, caffeine aspirin phenacetin, caffeine aspirin phenacetin, caffeine aspirin phenacetin, caffeine, aspirin Phenacetine Phenacetine | |||||||
| Encyclopedia |
| Free Tools: |
For surfers:
Free toolbar & extensions |
Word of the Day |
Help
For webmasters: Free content | Linking | Lookup box | Double-click lookup |
|---|