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Topic: Diode

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  Diode - Wikipedia, the free encyclopedia
Thermionic diodes are vacuum tube devices (also known as thermionic valves), which are arrangements of electrodes surrounded by a vacuum within a glass envelope, similar in appearance to incandescent light bulbs.
In vacuum tube diodes, a current is passed through the cathode, a filament treated with a mixture of barium and strontium oxides, which are oxides of alkaline earth metals.
The diode (originally a crystal diode) rectifies the AM signal, leaving a signal whose average amplitude is the desired audio signal.
en.wikipedia.org /wiki/Diode   (2979 words)

 Diode - MSN Encarta
The simplest of these, the germanium point-contact diode, dates from the early days of radio, when the received radio signal was detected by means of a germanium crystal and a fine, pointed wire that rested on it.
In modern germanium (or silicon) point-contact diodes, the wire and a tiny crystal plate are mounted inside a small glass tube and connected to two wires that are fused into the ends of the tube.
The Zener diode is a special junction-type diode, using silicon, in which the voltage across the junction is independent of the current through the junction.
encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761568776   (272 words)

There are two kinds of semiconductor diodes: a P-N junction diode, which forms an electrical barrier at the interface between N- and P-type semiconductor layers, and a Schottky diode, whose barrier is formed between metal and semiconductor regions.
The cathode of a diode is generally marked with a line next to it (on the diode body).
Diodes are also some times marked with an identifying color code (similar, but not identical, to that used for resistors); a good explanation is given here.
encyclobeamia.solarbotics.net /articles/diode.html   (1062 words)

 Diode Tutorial
In this discussion the term diode and rectifier will be used interchangeably; however, the term diode usually implies a small signal device with current typically in the milliamp range; and a rectifier, a power device, conducting from1 to 1000 amps or even higher.
However, the diode has an additional property; it is unidirectional, i.e.current flows in only one direction(anode to cathode internally).When a forward voltage is applied, the diode conducts; and when a reverse voltage is applied, there is no conduction.
The current rating of a diode is determined primarily by the size of the diode chip, and both the material and configuration of the package, Average Current is used, not RMS current.
www.americanmicrosemi.com /tutorials/diode.htm   (395 words)

 AllRefer.com - diode (Electrical Engineering) - Encyclopedia   (Site not responding. Last check: 2007-10-21)
A diode has a low resistance to electric current in one direction and a high resistance to it in the reverse direction.
In an Esaki, or tunnel, diode, the current through the device decreases as the voltage is increased within a certain range; this property, known as negative resistance, makes it useful as an amplifier (see tunneling).
Gunn diodes are negative-resistance diodes that are the basis of some microwave oscillators.
reference.allrefer.com /encyclopedia/D/diode.html   (474 words)

 Optogalvanic and Absorption Spectroscopy
Diode lasers operating in the infrared, and more recently in the visible red, have found many commercial applications, including use in fiber optic communications systems, laser printers, and remote sensing, and in consumer products such as compact dis k players, home security systems, and remote control devices.
Diode lasers capable of operation at a number of wavelengths in the range from 6500 Å (visible red) to 1.6 ┬Ám (near infrared), are now commercially available at low cost.
The diode laser chip emits an external laser beam that passes out of the case through a glass window, as well as a beam that travels to the rear of the case to a photodiode chip that provides a convenient internal monitor of the laser output power.
cat.middlebury.edu /~PHManual/opto.html   (3563 words)

 Howstuffworks "How Semiconductors Work"   (Site not responding. Last check: 2007-10-21)
A diode is the simplest possible semiconductor device.
Diodes can be used in a number of ways.
The diode simply blocks any current from leaving the battery if it is reversed -- this protects the sensitive electronics in the device.
www.howstuffworks.com /diode3.htm   (418 words)

 Define diode - a definition from Whatis.com
Most diodes are made with semiconductor materials such as silicon, germanium, or selenium.
Some diodes are comprised of metal electrodes in a chamber evacuated or filled with a pure elemental gas at low pressure.
Diodes of this type, with the application of a voltage at the correct level and the polarity, generate analog signals at microwave radio frequencies.
whatis.techtarget.com /definition/0,,sid9_gci213519,00.html   (449 words)

Diodes are the electrical version of a valve and early diodes were actually called valves.
Diodes must be connected the correct way round, the diagram may be labelled a or + for anode and k or - for cathode (yes, it really is k, not c, for cathode!).
Small signal diodes can be damaged by heat when soldering, but the risk is small unless you are using a germanium diode (codes beginning OA...) in which case you should use a heat sink clipped to the lead between the joint and the diode body.
www.kpsec.freeuk.com /components/diode.htm   (975 words)

 LEOT Laser Tutorial - Course 4: Laser Electronics - Module 6: Diode Laser Power Supplies   (Site not responding. Last check: 2007-10-21)
Modern diode lasers are formed of structures that contain several thin layers of material of varying composition.
This is denoted in the figure as "broad area." It allows the generation of higher power, because a larger volume of material may contribute to the laser operation, but it leads to greater astigmatism, because the limiting apertures in the directions parallel and perpendicular to the junction have much different values.
During start-up, the leads to the laser diode should first be shorted and the current control should be reduced to a low setting before the power supply is turned on.
repairfaq.ece.drexel.edu /sam/CORD/leot/course04_mod06/mod04-06.html   (7906 words)

 Diode identification
There are many types of diodes varying in size from the size of a pinhead (used in subminiature circuitry) to large 250-ampere diodes (used in high-power circuits).
Thus 1 designates a diode; 2 designates a transistor (which may be considered as made up of two diodes); and 3 designates a tetrode (a four-element transistor).
Keep in mind, whether the diode is a small crystal type or a large power rectifier type, both are still represented schematically, as explained earlier, by the schematic symbol shown in figure 1-12.
www.tpub.com /neets/book7/24k.htm   (499 words)

 Zener Diode Tutorial   (Site not responding. Last check: 2007-10-21)
Notice that as the reverse voltage is increased the leakage current remains essentially constant until the breakdown voltage is reached where the current increases dramatically.
This breakdown voltage is the zener voltage for zener diodes.
While for the conventional rectifier or diode it is imperative to operate below this voltage; the zener diode is intended to operate at that voltage, and so finds its greatest application as a voltage regulator.
www.americanmicrosemi.com /tutorials/zener.htm   (200 words)

 Laser Diode
These characteristics are discussed in greater detail throughout this article and in the article on light-emitting diodes.
The rear facet monitor PIN diode receives light from one end of the laser chip while the other end of the chip illuminates the optical fiber.
While the light in the fiber correlates to light in the monitor PIN diode, it never matches exactly at all output and environmental conditions, an phenomenon called tracking error.
www.fiber-optics.info /articles/laser-diode.htm#Figure_2   (2500 words)

 How to Test The High-Voltage Diode (Rectifier) Used In Microwave Ovens
The high-voltage rectifier (diode) works along with the high-voltage capacitor to effectively double the already-high voltage that is provided by the power transformer.
In most cases, defective diodes, whether shorted or open, will show some physical signs of the defect, such as a burned crack, a blistered spot, or it may even be split in two.
Measure the resistance across the terminals of the diode by touching the positive meter probe to the anode and the negative probe to the cathode (the cathode is the side that goes to ground, usually marked by an arrow, dot or stripe).
www.gallawa.com /microtech/diode.html   (714 words)

 Blocking Diodes
Unless specified, all diodes seen in these diagrams are rated at 1 ampere (1N4001/L).
The diode provides a path for current when the current path to the relay is interrupted (i.e.
The diode protects switch or relay contacts and other circuits that may be sensitive to voltage spikes.
www.the12volt.com /diodes/diodes.asp   (476 words)

 Diode Manufacturers, Rectifier, Schottky, Zener diodes
A diode is a two terminal device using a PN junction.
Diodes may be made from Silicon, Germanium, Selenium, or Gallium Arsenide.
Clamping Diode: A diode used to limit the peak voltage on a line to a pre-determined maximum voltage.
www.interfacebus.com /diode.html   (595 words)

 Sam's Laser FAQ - Diode Lasers
Electrical input to the laser diode may be provided by a special current controlled DC power supply or from a driver which may modulate or pulse it at potentially very high data rates for use in fiber optic or free-space communications.
The main beam as it emerges from the laser diode is wedge shaped and highly divergent (unlike a helium-neon laser) with a typical spread of 10 by 30 degrees.
There are two temperature tuning rates for a diode laser, one is the tuning of a given longitudinal mode with temperature and the other is the tuning over larger temperature changes where the lasing mode hope from longitudinal mode to longitudinal mode to be close to the peak of the gain curve.
members.misty.com /don/laserdio.htm   (20574 words)

 Diode Explanation   (Site not responding. Last check: 2007-10-21)
The Diode formula is specially prepared to emit forty-seven resonant frequencies that synchronize and promote a healthy human energy field.
When worn on the left side of the body, the harmonious Diode frequencies are picked up by the body's electrical system, stabilizing, balancing and energizing the human energy field.
By emitting neutralizing and balancing frequencies, the Diode also helps to counteract the effects of harmful and stray electromagnetic fields to which we are exposed to everyday.
www.emfsafe.com /DExp.htm   (287 words)

 Technorati Tag: diode   (Site not responding. Last check: 2007-10-21)
EDI for Diodes EDI is a manufacturer specializing in rectifier diodes, bridges, H.V. assemblies and custom designs for over 50 years.
Buy Diodes Online at HVCA and CKE At HVCA and CKE, we specialize in the design, development and manufacture of high voltage and high current diodes, bridge rectifiers, and custom assemblies for particular applications.
Advanced Power Technology- Diode Advanced Power Technology manufacturer of high power switching transistors (MOSFETS and IGBTs) Diodes, (FRED, Schottky, and Silicon Carbide), RF and Microwave Transistors, and Power Modules.
technorati.com /tag/diode   (418 words)

 The Diode   (Site not responding. Last check: 2007-10-21)
A less detailed model for the diode has any positive current flowing through the diode when it is forward biased, and no current when negative biased.
The diode's nonlinearity cannot be escaped here, and the clearly evident distortion must have some practical application if the circuit were to be useful.
Thus, the diode's current is proportional to the input voltage.
cnx.org /content/m0037/latest   (682 words)

 SANYO > Laser Diode   (Site not responding. Last check: 2007-10-21)
The low operating current and high operating temperature are realized by using misoriented substrate and MQW (Strain compensated) active layer.
With unique structures developed by SANYO, providing the following features, these laser diodes are highly rated in a broad range of applications including compact discs, CD-R/RW, DVD systems, bar code scanners, laser pointers and printers.
SANYO laser diodes are also compatible with multimedia and other new optical equipment on which advanced information societies in future depend.
www.sanyo.com /semiconductors/laser_diode   (174 words)

 Diode Trace   (Site not responding. Last check: 2007-10-21)
In this session a virtual instrument will be implemented which will generate and display diode characteristic curves.
Proposed Diode Curve Plotter VI A general flow diagram of the program is shown in Figure 3.
Compare the curves generated for the various diode types and prepare a report based on your observations.
www.seas.upenn.edu /ese/rca/software/Labview/diodetest/diodetest.html   (197 words)

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