is diode a pn junction?
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P-N junction semiconductor diode is also called as p-n junction semiconductor device. In n-type semiconductors, free electrons are the majority charge carriers whereas in p-type semiconductors, holes are the majority charge carriers.
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Bipolar junction transistors are bipolar devices, in this transistor there is a flow of both majority & minority charge carriers. Field effect transistors are unipolar devices, in this transistor there are only the majority charge carriers flows. Bipolar junction transistors are current controlled.
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The ideal diode equation is very useful as a formula for current as a function of voltage. However, at times the inverse relation may be more useful; if the ideal diode equation is inverted and solved for voltage as a function of current, we find: v(i)=ηVTln[(iIS)+1].
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Unipolar Transistor: They use a single charge carrier i.e. either electrons or holes for the operation. These do not have any junction as they are made up of either N-Type or P-type. Bipolar Transistor: As the name suggests two poles i.e. both the electrons and holes contribute in the operation.
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Diodes In Parallel. If the load current is greater than the current rating of a single diode, then two or more diodes can be connected in parallel (see Figure 1) to achieve a higher forward current rating. Diodes connection in parallel do not share the current equally due to different forward bias characteristics.
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The Forward Threshold Voltage is the amount of voltage needed to get the PN junction to conduct and allow current to flow in the forward direction. ... The Reverse Breakdown Voltage is the amount of voltage that would cause the PN junction to break down and allow current to flow in the reverse direction.
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Rectifier diodes are used in power supplies to convert alternating current (AC) to direct current (DC), a process called rectification. They are also used elsewhere in circuits where a large current must pass through the diode.
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In a p-type semiconductor, the III group element of the periodic table is added as a doping element, whereas in n-type the V group element is the doping element. In the n-type semiconductor, electrons are majority carriers, and holes are minority carriers. ...
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Principle of operation A photodiode is a PIN structure or p–n junction. When a photon of sufficient energy strikes the diode, it creates an electron–hole pair. This mechanism is also known as the inner photoelectric effect.
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Zener diode is heavily doped than the normal p-n junction diode. Hence, it has very thin depletion region. Therefore, zener diodes allow more electric current than the normal p-n junction diodes.
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Both Normal diode and Power diodes are uncontrolled devices because their On/Off situation depends upon the external circuit used. Normal diodes are used in small-signal applications whereas power diodes are used for high voltage and current applications such as in inverter.
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The two terminals of a diode are the anode and cathode.
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Depletion Region When a p-n junction is formed, some of the free electrons in the n-region diffuse across the junction and combine with holes to form negative ions. In so doing they leave behind positive ions at the donor impurity sites.
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Zener diodes are highly doped diodes. This means their behavior in forward bias will be same as a normal diode. But while in reverse bias their junction potential is increased. ... So that means when the voltage crosses 6V then the diode is in Reverse breakdown and hence the current through the diode increases rapidly.
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A photodiode, like a solar cell, is a photovoltaic semiconductor device. ... The difference is that a diode's p-n junction is usually covered in opaque packaging, while a photodiode's p-n junction is exposed to light through transparent packaging.
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Bipolar Junction Transistor (BJT) Switch. The Bipolar Junction Transistor can be used as a switch. This is required when the typical digital output (max current output 20ma) does not provide sufficent current drive for high current devices like lamps, solenoids or motors.
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Answer: NPN and PNP transistors are interchangeable if you remember one simple rule: A bipolar transistor is essentially two back-to-back diodes with the base being the common connection.