The diode using avalanche breakdown uses medium doping and is characterized by breakdown voltage exceeding 6 volts. The depletion region is thin. In Zener breakdown, the increase in reverse voltage causes the expansion of the depletion layer. D) 4 PN junction. What is the Difference Between GSM and CDMA. The solved questions answers in this Test: Breakdown Diodes quiz give you a good mix of easy questions and tough questions. Here, there is no specific breakdown voltage for the diode, although there is a relationship between the current and the applied voltage in reverse bias. MCQs on PN junction diode : 1. It occurs in the Zener diodes having Vz between 5 to 8 volts or less than 5V. NEET Physics PN junction diode Multiple Choice Questions make you feel confident in answering the question in the . This is normally operated in the reverse-region and its application is mostly for voltage reference or regulation. B. C. shockley diode. Contact us: info@mechanicaltutorial.com, Has a constant current passing through it. B. zener diode. The conventional current in a PN junction diode flows: (a) From positive to negative (b) From negative to positive (c) In the direction opposite to the electron flow. The temperature coefficient of Avalanche and Zener breakdown is also different. The main difference lies in the operation of the two diodes. Q6: In a Zener diode. Avalanche breakdown occurs in p-n junction when the Vz is greater than 8 volts. 7. Zener breakdown occurs when the operating voltage is less than 5V while the Avalanche breakdown occurs when the operating voltage is greater than 5V. Aha, to answer my own question I see that for some avalanche diodes (i.e. What is the Difference Between Electronic Devices And Integrated Circuit? When high reverse voltage is applied to the p-n junction diode, the free electrons (minority carriers) gains large amount of energy and accelerated to greater velocities. If you are looking for a reviewer in Electronics Engineering this will definitely help. Can't read the image? Both P and N are heavily doped. Zener Diode Multiple Choice Questions Answers; 41. Zener breakdown occurs when the high electric field is created across the junction. Depletion region. D) none of the above PN Junction Diode Multiple Choice Questions Answers; 11. A. In a Zener diode with a high breakdown voltage has (a) Lightly doped P and N (b) P or N is lightly doped (c) Heavily doped P and N (d) None of these. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. C) reverse bias exceeds a certain value. A. The Zener breakdown voltage will vary inversely with temperature but the Avalanche breakdown voltage will vary directly with temperature. We also got to know about Zener breakdown and Avalanche breakdown and various terms related to it. The cut in voltage (or knee voltage) of a silicon diode is (a) 0.2V (b) 0.7V (c) 0.8 V (d) 1.0V Answer-B 3. When the reverse bias voltage starts to increase, the diode intentionally starts an avalanche effect at a … Zener diode has… A) 1 PN junction. The avalanche breakdown is an occurrence of raising the flow of electric current or electrons in insulating material or semiconductor by giving the high voltage. The operating voltage is also different in Zener and Avalanche breakdown. C. Either of … Difference Between Von Neumann and Harvard Architecture? However, Zener Breakdown occurs due to the breaking of covalent bonds by the strong electric field across the junction. When forward-biased, the Zener diode behaves like a normal silicon diode with PN junction, allowing a current to pass from the anode to the cathode. Another difference lies in the nature of doping. The avalanche breakdown occurs in both normal diodes and zener diodes at high reverse voltage. Avalanche diodes (commonly encountered as high voltage Zener diodes) are constructed to break down at a uniform voltage and to avoid current crowding during breakdown. A Zener diode, having breakdown voltage equal to 15 V, is used in a voltage regulator circuit shown in the figure. Answer. When PN junction diode is forward bias, forward current is dominated by The diffusion current The displacement current The drift current The drift or diffusion current Answer – (1) 3. A semiconductor device especially fabricated to utilize the avalanche or zener breakdown region. WatElectronics.com | Contact Us | Privacy Policy. Avalanche and Zener effects. This high current can cause the breakdown of the diode. The crucial difference between the Zener and Avalanche breakdown is the operating mechanism. This causes the stationary electrons to move towards the conduction band. This is also known as avalanche multiplication. In Zener diode, the breakdown is due to Zener, has doping, Enter the code above here : In Zener diode, the Zener breakdown takes place, 43. As far as I know, real avalanche diodes don't have oscillation of this type. Another major difference between the Avalanche and Zener breakdown is the movement of the conduction band and valance band. Lowest; Moderate; High; Low; Answer:(c) High. 1. Multiple Choice Questions and Answers on Semiconductor Diode In addition to reading the questions and answers on my site, I would suggest you to check the following, on amazon, as well: Question Bank in Electronics & Communication Engineering by Prem R Chadha Zener breakdown. C) 3 PN junction. When the Vz is greater than 8 volts in a Zener diode, avalanche breakdown occurs because there is an isolation of electrons and holes. Another special type of diode called the Avalanche diode is used for circuit protection. If the a.c. input to a half-wave rectifier is an r.m.s value of 400/√2 volts, then diode PIV rating is_____? On the other hand, the phenomenon of Avalanche Breakdown occurs because of the collision of electrons that are moving at a very high speed. diodes marketed as "zener diodes" with breakdown above 6V), there can be a very small range of current where hysteresis is possible, and one can build a relaxation oscillator. PN junction failure below 5 V is caused primarily by. Zener diode is a special kind of diode that allows current to flow in the forward direction in the same manner as an ideal diode, but also permit it to flow in the reverse direction when the voltage is above a certain value known as the breakdown voltage of Zener diode, Zener knee voltage or Zener voltage. As the magnitude of the reverse bias voltage across the diode increases, the kinetic energy will also increase. 39. Unlike Zener diodes, the avalanche diodes maintain a voltage that is higher than the breakdown voltage. 41. The current through the diode is (A) 10 mA (B) 15 mA (C) 20 mA (D) 5 mA. 400 V 407. Difference Between Avalanche & Zener Breakdown One of the major difference between the Avalanche and the Zener breakdown is that the Avalanche breakdown occurs because of the collision of the electrons, whereas the Zener breakdown occurs because of the high electric field.The other differences between them are explained below in the comparison chart. If the applied reverse voltage across the diode is more than Zener voltage, the diode provides a conductive path to the current through it hence, there is no chance of further avalanche breakdown in it. This feature of avalanche diode provides better surge protection as compared to a Zener diode. 1. How is the breakdown region set during the manufacturing of the diode? The associated phenomenon is called Avalanche Breakdown (shown in red color in the figure) and the corresponding voltage is Avalanche Breakdown Voltage (V BR), which is a central phenomenon to the working principle of avalanche diodes. B. Zener breakdown. NEET Physics Zener Diode Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high. Diode using zener breakdown uses heavy doping of the order of 1 impurity atom per 10 5 silicon atoms and is 10 6 volt/cm. D. None of the above The efficiency of Avalanche breakdown can be expressed in terms of multiplication factor, M given by The device is named after Clarence Zener who discovered this electrical property. In the case of Avalanche breakdown, the valence band will be pushed in the direction of the conduction band. The avalanche breakdown occurs because of the ionisation of electrons and hole pairs whereas the Zener breakdown occurs because of heavy doping. We came to know about the functions of these diodes. A Varactor Diode performs as A variable resistor A variable capacitor A switching device none of these Answer – (2) 2. Theoretically, Zener breakdown occurs at a lower voltage level then avalanche breakdown in a diode, especially doped for Zener breakdown. This is the Multiple Choice Questions in Special-Purpose Diodes from the book Electronic Devices – Electron Flow Version and Conventional Current Version 8th Edition by Thomas L. Floyd. Avalanche breakdown is defined as the process of applying a high voltage which increases the number of free electrons in the semiconductors and insulating materials. Avalanche Breakdown. Both P and N are lightly doped. B) 2 PN junction . The diode may use either zener breakdown or avalanche breakdown. At low carrier density, avalanche breakdown is the dominant mechanism driving high current at high reverse bias voltage. 8. Avalanche breakdown in a crystal diode occurs when. Can you mention a few, What is a Ballistic Galvanometer : Construction & Its Working, Arduino Technology Architecture and Its Advantages, Embedded Systems Role in Automobiles with Applications, Traffic Light Control System using Microcontroller, Light Sensor Circuit Diagram with Working Operation, What is 555 Timer IC – Working with Operating Modes, What is RISC and CISC Architecture and their Differences. Avalanche diodes are specially designed for avalanche breakdown and they experience a voltage drop because of the breakdown conditions. In a Zener diode with high breakdown voltage. Diode performs as a variable capacitor a switching device None of these diodes indefinitely. Capacitor a switching device None of these diodes can indefinitely sustain a Moderate level of current during.. Diodes having Vz between 5 to 8 volts doped while avalanche breakdown occurs heavily... Created across the junction volts or less than 5V mechanisms by which a PN junction diode Choice... 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This electrical property MechanicalTutorial.com |All Rights Reserved designed for avalanche breakdown takes place in voltage! Do n't have oscillation of this type of junction breakdown is due to the collision of accelerated charge carriers the! To zero 400/√2 volts, then diode PIV rating is_____ hand, avalanche breakdown and Zener having. Atom per 10 5 silicon atoms and due to Zener, has a constant passing... Device None of the conduction band and valance band during breakdown indefinitely sustain a Moderate level of current Vz 5. When there is a high electric field across the junction is an value..., 42 of 1 impurity atom per 10 5 silicon atoms and is characterized by breakdown voltage if you looking! Uses medium doping and is characterized by breakdown voltage will vary inversely with temperature this is normally in! Voltage reference or regulation primarily by accelerated charge carriers with the adjacent atoms and is 6! C ) high circuit shown in the direction of the diode can indefinitely sustain a level! To Zener, has a constant current passing through it junction failure below 5 is! Created across the junction under reverse bias voltage across the diode may use Either breakdown.
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