Diode
hideIn electronics, a diode is a two-terminal device (thermionic diodes may also have one or two ancillary terminals for a heater).
Diodes have two active electrodes between which the signal of interest may flow, and most are used for their unidirectional electric current property. The varicap diode is used as an electrically adjustable capacitor.
The unidirectionality most diodes exhibit is sometimes generically called the rectifying property. The most common function of a diode is to allow an electric current in one direction (called the forward biased condition) and to block the current in the opposite direction (the reverse biased condition). Thus, the diode can be thought of as an electronic version of a check valve.
Real diodes do not display such a perfect on-off directionality but have a more complex non-linear electrical characteristic, which depends on the particular type of diode technology. Diodes also have many other functions in which they are not designed to operate in this on-off manner.
Early diodes included “cat’s whisker” crystals and vacuum tube devices (also called thermionic valves). Today most diodes are made of silicon, but other semiconductors such a germanium are sometimes used.
For more information about Diode, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with diode
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Oct 30, 2009 |
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(PhysOrg.com) -- NEC and Brother are both developing wearable prototype devices that use Retinal Imaging Display (RID) technology to project images directly on the wearer's retina. NEC's gadget is designed ...
Lighter, cheaper, LED light bulbs are starting to enter the marketplace
Oct 22, 2009 |
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Just when you were finally warming up to the idea of swapping out your old light bulbs with compact fluorescent ones, you may soon find a new alternative at your local hardware store.
Researchers create molecular diode
Oct 22, 2009 |
4.8 / 5 (4) |
0
(PhysOrg.com) -- Recently, at Arizona State University’s Biodesign Institute, N.J. Tao and collaborators have found a way to make a key electrical component on a phenomenally tiny scale. Their single-molecule diode is described ...
Researchers create molecular diode
Oct 13, 2009 |
4.4 / 5 (12) |
0
Recently, at Arizona State University's Biodesign Institute, N.J. Tao and collaborators have found a way to make a key electrical component on a phenomenally tiny scale. Their single-molecule diode is described ...
Atomtronic transistor and diode could advance quantum computing
Oct 09, 2009 |
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(PhysOrg.com) -- What if atoms could be used to perform the functions currently the province of electronic devices? The goal of atomtronics is to do just that by creating analogues to the common items found in electronic ...
Super-thin flexible OLED from Sony
Electronics / Consumer & Gadgets
Oct 07, 2009 |
4.7 / 5 (27) |
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(PhysOrg.com) -- Sony is showing off prototypes incorporating its super-thin, flexible OLED technology at the CREATEC JAPAN 2009 IT and electronics trade show in Makuhari Messe (Chiba) in Japan.
Greenlighting a greener world (w/ Video)
Sep 02, 2009 |
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Just a few years ago, most conversations Christian Wetzel had about his research began with a quick explanation of LEDs.
LG to Launch 15-inch OLED TV
Electronics / Consumer & Gadgets
Sep 01, 2009 |
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(PhysOrg.com) -- The Korean company, LG Electronics, the second largest television manufacturer in the world, has announced it will launch a 15-inch organic display TV set in early September. The announcement, ...
Ultrathin light-emitting diodes create new classes of lighting and display systems
Aug 20, 2009 |
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(PhysOrg.com) -- A new process for creating ultrathin, ultrasmall inorganic light-emitting diodes (LEDs) and assembling them into large arrays offers new classes of lighting and display systems with interesting ...
New material for nanoscale computer chips
Nanotechnology / Nanomaterials
Aug 17, 2009 |
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Nanochemists from the Chinese Academy of Sciences and Nano-Science Center, Department of Chemistry at University of Copenhagen have developed nanoscale electric contacts out of organic and inorganic nanowires. ...
Liquid-OLED Offers More Light-Emitting Possibilities
Aug 14, 2009 |
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(PhysOrg.com) -- As organic light-emitting diodes (OLEDs) are poised to go mainstream in the near future, scientists continue to explore new twists on the technology. Recently, researchers have fabricated ...
LED light bulbs yield big savings in energy
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One way the United States could slash its electricity use, dependence on fossil fuels and emissions of heat-trapping gases is really quite simple: better light bulbs.
Sony Debuts Digital Still Camera with Back-Illuminated 'Exmor R' CMOS Sensor
Electronics / Consumer & Gadgets
Aug 06, 2009 |
3 / 5 (1) |
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Sony today announced two new Cyber-shot cameras (DSC-TX1 and DSC-WX1 models) that provide unprecedented advances in low-light performance with approximately twice the sensitivity of cameras with traditional ...
LED closes the yellow gap: Full conversion of blue into amber light by new nitride phosphor
Jul 23, 2009 |
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(PhysOrg.com) -- Monochromatic light-emitting diodes cover a large part of the visible spectrum with high effi-ciency. For blue light, nitride diodes achieve external quantum efficiencies in excess of 65%, ...
Beyond flash -- memories are made of this
Jul 22, 2009 |
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(PhysOrg.com) -- The race is on for a successor to the popular 'flash' memory used in portable devices. European researchers think they have found a candidate in novel materials combined with a simple, easily ...
