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at thebeginning of electronic technology the vacuum tube was used in electronic circuit. .but now a days semiconductors are used in electronic circuit
Wiki User
∙ 14y ago
Wiki User
∙ 14y agoIt depends on the application. Each has its benefits. Most of the time, the semiconductor is better.
The vacuum diode is today costly and used only rarely, for special purposes.
examples of vacuum diode use:
Need a very linear Vf/current curve extending nearly to 0 volts. Even today, that function can be done almost perfectly with an op-amp circuit.
Need a high voltage rectifer that will tolerate overvoltages, arcing, and other electrical abuse.
Need extreme reverse resistance.
Some musicians and audiophiles prefer them, believing they contribute to the sound characteristics of an amplifier by affecting the way the power supply responds to changing loads
Military use, EMP-proof. A tube diode is definitely the under dog for a diode. It needs cathode power source and the voltage drop across is very hi making it impossible to carry a lot of current as opposed to silicone semiconductor type. And i don't understand why musician will like this type of device. it only produce DC and DC is never ending. Possibly it may refer to the dynamics of tube amplifiers which i do agree have better dynamics of sort.
Wiki User
∙ 12y agoIntegrated circuits use semiconductor material for the electrons to flow, and variations in the type of material to control the flow. Vacuum tubes use an electron beam and a voltage applied to a grid to slow down or speed up the electrons. One major difference in practice, is that vacuum tubes require much more power to operate, and generate much more heat than semiconductors. For some high power applications (guitar amps, radio transmission), vacuum tubes may be the best tool for the job.
Wiki User
∙ 14y agoAn integrated circuit is any circuit that is integrated into a single chip. A differential (amplifier?) circuit is a specific type of circuit, which can be built from discrete parts, but is often built into (analog) integrated circuits (ICs) as a fundamental component of the IC.
Wiki User
∙ 13y agoA: An IC can perform many functions while the tube can only amplify. The IC is very small in size1000:1 ratio. the IC is very power efficient compered to a tube. To add the IC chip is even smaller then the actual size most of the bulk is plastic and it is needed to route internal wire connection to the external terminals
Wiki User
∙ 12y agoAn integrated circuit uses transistors instead of vacuum tubes. Transistors and vacuum tubes can do the same things, in terms of how they alter the flow of an electric current in a circuit, however, vacuum tubes are much larger, and they are also much less reliable, since they will eventually burn out, unlike transistors. So with transistors you can do a lot more. Even though the earliest electronic computer (ENIAC) was made with vacuum tubes, nobody today would want to attempt to build a computer with vacuum tubes.
Wiki User
∙ 11y ago- A circuit board has several components soldered to it, some of these components may be integrated circuits.
- The circuit board may be changed or rewired by hand, an integrated circuit cannot normally be changed or rewired (except for some Programable Logic Device integrated circuits, which can be changed electronically).
- A circuit board is typically made of fiberglass-epoxy or paper-epoxy with copper traces connecting the components, a monolithic integrated circuit is made of a semiconductor (e.g. silicon, gallium arsenide) typically with aluminum traces connecting the components, a hybrid integrated circuit is typically made of ceramic.
Wiki User
∙ 14y agoNo difference both are active devices THE DIFFERENCE maybe in understanding that an IC may contain thousands of transistors
Wiki User
∙ 9y agoIn simple words, an IC is a combination of more than 100's of transistors where are a transistor is a single device
MUKIIBI JAMES
Difference between vacuum tube and semi conductor
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Why schottky is called hot carrier diode?
Because the energy of electrons transfer from semiconductor to metal side have more energy than the fermi energy of electrons in metal side. That's why these are called hot carrier diodes
What are the differences between power diode and signal diode?
Simple diode is a two-terminal pn-junction with appropriate contacts for connecting the junction to external circuits. Power diode is formed by alloying, diffusion, and epitaxial growth. The modern techniques in semiconductor fabrication processes permit the desired device characteristics. The operation of power diodes is similar to that of signal diodes; but it has larger power-, voltage-, and current-handling capabilities than those of ordinary diodes. Switching speed of the power diodes is low compared to that of signal diodes.
How does the cut in voltage effects the output of a diode?
The cut in voltage is that voltage where after the current increase rapidly and it's value is different-2 for different type of semiconductor. for silicon it is 0.7 and for germanium it is 0.3 volt. It means if you made a diode from silicon than applied voltage below 0.7 volt will not able to flow current (if flow than it is in term of few micro ampere) . it means diode will stay in off mode and for germanium same things will happen and it will rest on off condition below 0.3 volt(applied).
What is a substitute for a germanium diode?
There is no exact substitute for a germanium diode, except another germanium diode. However if the only concern is to get a lower forward voltage drop than that of a silicon diode (0.7V), then a schottky barrier diode may be a suitable replacement as its forward voltage drop (<0.1V) is even lower than that of a germanium diode (0.2V).
Why power diode has more power ratings?
It will be dissipating more power than a small signal diode.
What is diode and define some of its applications?
a diode is any electronic device that conducts current significantly better in one direction than the other. it can be a vacuum tube diode, a gas filled tube diode, a point contact semiconductor diode, a junction semiconductor diode, any of several metal oxide diodes, etc.typical applications are:AC power rectifiersAmplitude modulated radio signal demodulators (detectors)Gas filled tube diodes used to be used in certain types of digital counters and computer registersDigital logic gatesSign detection circuits in analog computersVoltage clamps and clippersFrequency modulated radio amplitude limiters to remove static and interferenceetc.
What is a Shockley diode?
An ordinary semiconductor diode uses a P-N junction, but when reverse biased it takes a period of time to remove the current carriers from that junction to create the depletion region that blocks reverse conduction. A Shockley diode instead uses a P semiconductor-metal junction, which removes the current carriers much faster from the semiconductor allowing the device to switch much faster. It also has a much lower forward bias voltage than an ordinary diode. In many ways it is similar to the previous point contact diodes (a piece of semiconductor like galena or germanium with a metal "cat's whisker" point contact) in operation, but is more reliable and easier to mass produce.
Why Si is used than Ge in semiconductor diode?
silicon diodes Cut in voltage is 0.7 V.but the Germanium cut in voltage is 0.3 V that's why .............
Is fibreglass a better insulator than vacuum?
No. If you can get it, vacuum is the best insulator.
Why does a diode not conduct in reverse bias?
A diode cannot conduct in reverse bias because of the way it was made. If the question is asking about a thermionic vacuum tube diode, the electrons produced by the heated cathode of the tube can only move in one direction: from the cathode to the anode - but only for as long as the anode is positively charged. The reason is that, if the anode is made to be positively-charged, it ATTRACTS electrons - which are negatively charged - from the cathode, so a current flows from cathode to anode in the "normal" biased direction because of the physical fact that UNLIKE CHARGES ATTRACT ONE ANOTHER. If the anode is made to be negatively charged, the electrons won't go to it because of the physical fact that LIKE CHARGES REPEL ONE ANOTHER, so no electrical current can flow from the cathode to a negatively charged anode. (In fact no electrical current can ever flow from a negative anode to the cathode for an entirely different reason: no anode of any normal thermionic vacuum tube was ever designed and made to "produce" electrons in the way that a heated cathode produces them!) To be able to "produce" electrons and let them fly to the positively charged anode, the cathode must be able to receive some more electrons to replace all the ones that have left the space around the cathode. That "supply of more electrons" is called an electric current. That current does not come from nowhere - it has to comes from a source, such as a battery or a generator - and the electrons which reach the anode must then be conducted back to the battery or a generator so that they complete a full electrical circuit by traveling along the wires which connect the source to the diode. Similarly, because of the way it was made, a semiconductor diode behaves in just the same way as a vacuum tube diode: electrons can flow from the negative end to the positive end of the semiconductor diode but not the other way around. The actual reason why a semiconductor diode works like that is very much more complicated to explain than for a vacuum tube diode. Put very simply, a semiconductor diode has the kind of materials inside it that will only allow electrons to flow one way. If a voltage is applied to the diode the wrong way round (called reverse bias) practically no current can flow through the diode.
Why diode does not conduct in reverse bias?
A diode cannot conduct in reverse bias because of the way it was made. If the question is asking about a thermionic vacuum tube diode, the electrons produced by the heated cathode of the tube can only move in one direction: from the cathode to the anode - but only for as long as the anode is positively charged. The reason is that, if the anode is made to be positively-charged, it ATTRACTS electrons - which are negatively charged - from the cathode, so a current flows from cathode to anode in the "normal" biased direction because of the physical fact that UNLIKE CHARGES ATTRACT ONE ANOTHER. If the anode is made to be negatively charged, the electrons won't go to it because of the physical fact that LIKE CHARGES REPEL ONE ANOTHER, so no electrical current can flow from the cathode to a negatively charged anode. (In fact no electrical current can ever flow from a negative anode to the cathode for an entirely different reason: no anode of any normal thermionic vacuum tube was ever designed and made to "produce" electrons in the way that a heated cathode produces them!) To be able to "produce" electrons and let them fly to the positively charged anode, the cathode must be able to receive some more electrons to replace all the ones that have left the space around the cathode. That "supply of more electrons" is called an electric current. That current does not come from nowhere - it has to comes from a source, such as a battery or a generator - and the electrons which reach the anode must then be conducted back to the battery or a generator so that they complete a full electrical circuit by traveling along the wires which connect the source to the diode. Similarly, because of the way it was made, a semiconductor diode behaves in just the same way as a vacuum tube diode: electrons can flow from the negative end to the positive end of the semiconductor diode but not the other way around. The actual reason why a semiconductor diode works like that is very much more complicated to explain than for a vacuum tube diode. Put very simply, a semiconductor diode has the kind of materials inside it that will only allow electrons to flow one way. If a voltage is applied to the diode the wrong way round (called reverse bias) practically no current can flow through the diode.
What material conducts electric current better than an insulation but not as well as a conductor?
semiconductor
What material conductors electric current better than an insulator but not as well a conductor?
semiconductor
Is a glass vacuum thermos vacuum better than a stainless steel vacuum?
Theoretically yes because glass is a poorer thermal conductor than steel.
How does a diode shorted?
due to high voltage across the diode ie more than piv of the diode or current flows more than maximum allowed range of diode.
Why schottky is called hot carrier diode?
Because the energy of electrons transfer from semiconductor to metal side have more energy than the fermi energy of electrons in metal side. That's why these are called hot carrier diodes
Why is there a gap in zener diode If you look through the glass to a untrained person it looks broken. Why?
In glass mounted diodes the semiconductor chip is very tiny and is mounted between two metal posts that terminate the ends of the leads. These posts are much larger than the tiny semiconductor chip, so it is easy to see light through the gap between the posts and fail to see the tiny semiconductor chip. The only way to tell if a zener diode is good or bad is to test its zener voltage (which must be done out of circuit and requires equipment not commonly available to the electronics hobbyist).
