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Topic: Zener diode

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	Zener effect and Zener diodes
		The breakdown process depends upon the applied electric field, so by changing the thickness of the layer to which the voltage is applied, zener diodes can be formed which break down at voltages from about 4 volts to several hundred volts.
		The zener diode uses a p-n junction in reverse bias to make use of the zener effect, which is a breakdown phenomenon which holds the voltage close to a constant value called the zener voltage.
		It is useful in zener regulators to provide a more constant voltage, for improvement of regulated power supplies, and for limiter applications.
	hyperphysics.phy-astr.gsu.edu /hbase/solids/zener.html (171 words)

	Zener Diode Tutorial
		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)

	Zener Regulators
		of the zener diode makes it a valuable component for the regulation of the output voltage against both variations in the input voltage from an unregulated power supply or variations in the load resistance.
		The current through the zener will change to keep the voltage at within the limits of the threshold of zener action and the maximum power it can dissipate.
		One strategy for designing a Zener regulator circuit is to design for a maximum power dissipated in the zener diode when the regulator is open circuited.
	hyperphysics.phy-astr.gsu.edu /hbase/electronic/zenereg.html (235 words)

	zener diode tester circuit diagram
		Here is a handy zener diode tester which tests zener diodes with breakdown voltages extending up to 120 volts.
		This AC voltage is converted to DC by diode D1 and filter capacitor C2 and is used to test the zener diodes.
		For testing a zener diode of unknown value, connect it across points A and B with cathode towards A. Adjust potmeter VR1 so as to obtain the maximum DC voltage across A and B. Note down this zener value corresponding to DC voltage reading on the digital multimeter.
	www.electronic-circuits-diagrams.com /testimages/testckt4.shtml (388 words)

	Zener Diodes
		Zener diodes are silicon rectifiers in which the reverse current remains small until the breakdown voltage is reached and then increases rapidly with little further increase in voltage.
		Zener diodes are useful as stabilizing devices and as reference voltage sources.
		Because the forward characteristic of a compensating diode is similar to the transfer characteristics of a transistor, the diode can maintain transistor bias voltages within 0.015 volt of a desired value despite supply-voltage variations up to 40 per cent and simultaneously compensate for a wide range of ambient-temperature variations.
	www.eteonline.com /zener_diodes.html (172 words)

	Diode - ExampleProblems.com
		Diodes may be made from semiconductor materials such as silicon or germanium or may be fabricated using devices depending on thermionic emission: tubes (US) (or valves in UK).
		The first diodes were vacuum tube devices (also known as thermionic valves), arrangements of electrodes surrounded by a vacuum within a glass envelope, similar in appearance to incandescent light bulbs.
		For special purpose diodes like the avalanche or zener diodes, the concept of PIV is not applicable since they have a deliberate breakdown beyond a known reverse current such that the reverse voltage is "clamped" to a known value (called zener voltage).
	www.exampleproblems.com /wiki/index.php/Diode (2951 words)

	Zener diode
		In case of forward-bias (in the direction of the arrow) the diode exhibits a voltage drop of roughly 0.7 volt.
		A Zener diode contains a heavily doped p-n junction allowing electrons to tunnel from the valence band of the p-type material to the conduction band of the n-type material.
		Another type of diode designed to break down under reverse bias, by a different mechanism to the Zener diode, is the avalanche diode.
	www.ebroadcast.com.au /lookup/encyclopedia/ze/Zener_diode.html (249 words)

	*** MICROST TUTORIAL: ZENER DIODE *****
		Therefore it is begun to slowly rotate the hinge of R2 towards the R1 resistance, that is towards the positive clip of the local p0wer source and the behavior of the index of the tester is observed, that it must commutated in the function of voltmeter for d.c.
		And this is the effect provoked from diode zener DZ, for which a model with voltage zener of 5,6 V has been chosen obviously.
		7 - In this circuit, in which the diode zener is inserted with direct polarization, that is with the anode turned towards the line of the positive voltage and the cathode towards that negative, the semiconductor is behaved as a silicon diode.
	www.microst.it /Tutorial/eng/zener_4.html (339 words)

	Zener diode - Biocrawler (Site not responding. Last check: )
		By exceeding the breakdown voltage a conventional diode is destroyed in the breakdown due to excess current and overheating.
		However, the current is not unlimited, so the Zener diode is typically used to generate a reference voltage for an amplifier stage, or as a voltage stabilizer for low-current applications.
		In a 5.6 volt diode, the two effects occur together and their temperature coefficients neatly cancel each other out, thus the 5.6 volt diode is the part of choice in temperature critical applications.
	www.biocrawler.com /encyclopedia/ZD (502 words)

	Zener diode biased electron multiplier with stable gain characteristic - Patent 5440115
		The present invention is based upon the discovery that a reverse biased zener diode placed in the output circuit of a channel electron multiplier (CEM) maintains a constant potential between the CEM output and the collector.
		The anode end 44 of the zener diode 40 is electrically connected to the output 38 of the electron multiplier 32 and the cathode end 46 of the zener diode 40 is electrically connected to the system reference potential, indicated by the ground symbol.
		R.sub.z is the resistance of the bias leg, i.e., or zener diode 40 and R.sub.d is the resistance of the CEM.
	www.freepatentsonline.com /5440115.html (3082 words)

	Electronics I Experiment on Zener Diodes
		Zener breakdown is one example of "tunneling" phenomena that occurs in solid state devices as electrons and holes actually go "through" rather than "over" a potential energy barrier due to quantum mechanical effects associated with the wave characteristics of electrons and the Heisenberg Uncertainty Principle.
		A back to back pair of Zener diodes can also be used to clip off high voltage spikes from the incoming power line voltage as long as the total energy of the spike is below the maximum energy level of the diode.
		Explain how Zener diodes are often used as the "second line" (after a fuse or circuit breaker) of defense in protecting a commercial electronic appliance from a brief high voltage surge in the input power line.
	engr.astate.edu /jdg/Electronics/Lab1/07Zener.html (1285 words)

	Semiconductor Devices
		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, for a real diode, other factors are also important: in particular, edge effects around the border of the junction cause the actual reverse current to increase slightly with reverse voltage, and the finite conductivity of the doped semiconductor ultimately restricts the forward current to a linear increase with increasing applied voltage.
		Notice the reverse characteristics are the same as discussed previously for the rectifier or diode, having a breakover voltage with its attending avalanche current; and a leakage current for voltages less than the breakover voltage.
	www.mtmi.vu.lt /pfk/funkc_dariniai/diod/p-n_devices.htm (2760 words)

	Zener diode patent invention
		[0006] In the zener diode 500, a pn junction face of the diode is formed at the bottom surface of the n.sup.+ cathode region 54 which overlaps with the p.sup.+ anode region 53 (The symbol of the diode is indicated in FIG.
		Zener voltage (breakdown voltage) is determined by concentrations of impurity in the p.sup.+ anode region 53 and n.sup.+ cathode region 54 which adjoin each other through the pn junction face.
		Because the pn junction (zener junction) is formed near the surface of the substrate 51, therefore, electrons formed by zener breakdown are trapped in the surface oxide film 55 (charge-up phenomenon).
	www.freshpatents.com /Zener-diode-dt20070125ptan20070018283.php (869 words)

	Zener Diodes - Diodes And Rectifiers
		Zener diodes are manufactured with zener voltages ranging anywhere from a few volts to hundreds of volts.
		Zener diodes are designed to be operated in reverse-bias mode, providing a relatively low, stable breakdown, or zener voltage at which they being to conduct substantial reverse current.
		A zener diode may function as a voltage regulator by acting as an accessory load, drawing more current from the source if the voltage is too high, and less if it is too low.
	www.opamp-electronics.com /tutorials/zener_diodes_3_03_09.htm (2351 words)

	4.1 zener (Site not responding. Last check: )
		Using this concept, zener diodes are designed to always break down at a specific reverse voltage and maintain that voltage for a range of currents without permanent damage.
		In the robot kit, zener ZD and Transistor TR3 shown in the robot Schematic are used to provide a constant 5v to the robot circuit electronics.
		The zener's forward biased behavior is the same as that of a regular diode so that is useful to see.
	web.acc.qcc.cuny.edu /nsfrobot/zenerbhv.htm (543 words)

	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.
		For special purpose diodes like the avalanche or zener diodes, the concept of PIV is not applicable since they have a deliberate breakdown beyond a known reverse current such that the reverse voltage is "clamped" to a known value (called the zener voltage or breakdown voltage).
	en.wikipedia.org /wiki/Diode (3001 words)

	Radio-Electronics.Com :: Summary of the Zener Diode
		Zener diodes are semiconductor diodes that are widely used as voltage reference sources in the electronics industry.
		Zener diodes or as they may sometimes be called, reference diodes operate like an ordinary diode in the forward bias direction.
		The actual reverse voltage is repeatable for a given diode and is dependent upon the internal geometry and characteristics of the diode.
	www.radio-electronics.com /info/data/semicond/zenerdiode/zener.php (724 words)

	A Zener Diode Negative Peak Limiter (Site not responding. Last check: )
		Zener diodes are a special type of silicon diodes that are designed to operate in the reverse conduction area (reverse biased).
		Zeners are often used in voltage regulation circuits in a manner similar to the more familiar gas regulator tubes (OA2, OA3, etc.) Zener diodes are specified by voltage and power dissipation.
		Since zener diode are commonly available in voltages from a few volts to about about 200 volts, the number used will depend mostly on the power dissipation requirement.
	www.amwindow.org /tech/htm/zenlim.htm (859 words)

	zener diode, diode fuction, Rectifier diodes
		A diode is called a half wave rectifier when it is used to convert alternating current electricity into direct current, by removing the negative portion of the current.
		Diodes are frequently used to conduct dangerously high voltages away from sensitive devices, most commonly by being reverse-biased (non-conducting) under normal circumstances, and becoming forward-biased (conducting) when the voltage rises above its normal value.
		In a normal silicon diode, the drop in potential across a conducting diode is approximately 0.6 to 0.7 volts.
	www.igtrading.com /diode/index.html (2121 words)

	diodes
		The first diode in figure 1 is a semiconductor diode which could be a small signal diode of the 1N914 type commonly used in switching applications, a rectifying diode of the 1N4004 (400V 1A) type or even one of the high power, high current stud mounting types.
		The second of the diodes is a zener diode which are fairly popular for the voltage regulation of low current power supplies.
		Zener diodes work on the principle of essentially a constant voltage drop at a predetermined voltage (determined during manufacture).
	www.electronics-tutorials.com /basics/diodes.htm (2292 words)

	Fixed Voltages
		In the standard circuit, the zener diode is connected across the fan with its banded cathode end pointing to the positive supply.
		The nearest zener diode is 9.1V, and we'll use a commonly-available 1.3W type.
		Note the diode across the regulator is optional – it protects the regulator against reverse voltage from C2 or the load if the supply side is shorted to ground.
	www.cpemma.co.uk /diodes.html (1397 words)

	Diodes
		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!).
		Zener diodes are used to maintain a fixed voltage.
		Zener diodes can be distinguished from ordinary diodes by their code and breakdown voltage which are printed on them.
	www.kpsec.freeuk.com /components/diode.htm (975 words)

	Diode - HvWiki
		Diodes have a voltage drop, that is usually in the range of 0.3V to several volts depending on the diode.
		They did essentially the same thing as a silicon diode, but were much larger (a 250 amp 3 phase mercury rectifier would about 3 meters long and almost 50cm in diameter, compared to a silicon diode that would be less that 10cm square) and more delicate.
		Diodes are generally used to force current to go in one direction, although they can also be used to create a controlled voltage drop, regulate current, regulate voltage, and even provide light.
	wiki.4hv.org /index.php/Diode (1510 words)

	Regular Diodes (Site not responding. Last check: )
		However, unlike a resistor, a diode does not behave linearly with respect to applied voltages and hence is not simply described by an equation such as Ohm's law for resistors.
		Zener Diode: Used to provide reference voltages so the adapters you use will put out the correct voltage values so as not to overcharge or damage today's new generation of Li-Ion and NIMH batteries.
		Measure the resistance of the diode with an ohmmeter first with the red meter lead on the anode followed by the red lead on the cathode.
	web.acc.qcc.cuny.edu /nsfrobot/diode.htm (1044 words)

	Zener Diodes - Microwave Encyclopedia - Microwaves101.com
		Zener diodes really have no use as a "microwave device", except maybe as a voltage reference or protection circuit, named after Clarence Melvin Zener.
		Zeners are also sometimes used as over-voltage protection devices.
		But 100mA through a 12V zener causes 1.2W of dissipation, and a physically large diode may be required.
	www.microwaves101.com /encyclopedia/diodes_zener.cfm (278 words)

	Zener Diode (Site not responding. Last check: )
		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.patchn.com /zener.htm (191 words)

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