diode - definizione. Che cos'è diode
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Cosa (chi) è diode - definizione

ABSTRACT ELECTRONIC COMPONENT WITH TWO TERMINALS THAT ALLOWS CURRENT TO FLOW IN ONE DIRECTION
Silicon rectifiers; Thermionic diode; Silicon diode; Crystal diode; Semiconductor diode; Shockley's diode equation; Shockley equation; Shockley's equation; Point contact diode; Germanium diode; Power diode; Point-contact diode; Junction diode; Diodes; Diode forward voltage drop; Reverse recovery time; Applications of diodes
  • 225px
  • A vacuum tube containing two power diodes
  • Schematic of basic ac-to-dc power supply
  • 225px
  • Structure of a [[vacuum tube]] diode. The filament itself may be the cathode, or more commonly (as shown here) used to heat a separate metal tube which serves as the cathode.
  • This simple diode clamp will clamp the negative peaks of the incoming waveform to the common rail voltage
  • [[Current–voltage characteristic]] of a p–n junction diode showing three regions: '''Breakdown''', '''Reverse''' biased, '''Forward''' biased. The exponential's "knee" is at V<sub>d</sub>. The leveling off region which occurs at larger forward currents is not shown.
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  • doping]] level, leading to built-in potential of ~0.59V. Observe the different [[quasi Fermi level]]s for conduction band and valence band in n and p regions (red curves).
  • envelope demodulator]] circuit.
  • 110px

diode         
<hardware, electronics> A semiconductor device which conducts electric current run in one direction only. This is the simplest kind of semiconductor device, it has two terminals and a single PN junction. One diode can be used as a half-wave rectifier or four as a full-wave rectifier. (1995-03-14)
diode         
['d????d]
¦ noun Electronics
1. a semiconductor device with two terminals, typically allowing the flow of current in one direction only.
2. a thermionic valve with two electrodes.
Origin
early 20th cent.: from di-1 + a shortened form of electrode.
Diode         
A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance in one direction, and high (ideally infinite) resistance in the other.

Wikipedia

Diode

A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance). It has low (ideally zero) resistance in one direction, and high (ideally infinite) resistance in the other.

A semiconductor diode, the most commonly used type today, is a crystalline piece of semiconductor material with a p–n junction connected to two electrical terminals. It has an exponential current–voltage characteristic. Semiconductor diodes were the first semiconductor electronic devices. The discovery of asymmetric electrical conduction across the contact between a crystalline mineral and a metal was made by German physicist Ferdinand Braun in 1874. Today, most diodes are made of silicon, but other semiconducting materials such as gallium arsenide and germanium are also used.

The obsolete thermionic diode is a vacuum tube with two electrodes, a heated cathode and a plate, in which electrons can flow in only one direction, from cathode to plate.

Among many uses, diodes are found in rectifiers to convert alternating current (AC) power to direct current (DC), demodulation in radio receivers, and can even be used for logic or as temperature sensors. A common variant of a diode is a light-emitting diode, which is used as electric lighting and status indicators on electronic devices.

Esempi dal corpus di testo per diode
1. He also replaced all incandescent lights with compact fluorescent or light–emitting diode bulbs –– even on his Christmas tree.
2. The world first Organic Light–Emitting Diode(OLED) TV has a contrast rating of 1,000,000 to 1, which produces amazingly sharp images.
3. Philips of the Netherlands has agreed to buy Agilent‘s 47 per cent stake in Lumileds Lighting, the light–emitting diode maker, for about $'45m.
4. Samsung, the largest maker of memory chips and liquid crystal display (LCD) screens, is likely to bet on developing next–generation magnetic RAM and ferroelectric RAM chips and organic light–emitting diode (OLED) display technology.
5. Earlier this month Sony said its European launch would be delayed by four months because of supply problems with its blue diode laser, a key component of the PS3‘s Blu–ray DVD player.