This state of diode is known as forward biased state. An IMPATT diode (IMPact ionization Avalanche Transit-Time diode) is a form of high-power semiconductor diode used in high-frequency microwave electronics devices. Choose the letter of the best answer in each questions. Breakdown occurs in the region very close to the P+ (i.e. 114. The magnetic field is used with a ruby maser to. The biggest disadvantage of the IMPATT diode is its A. lower efficiency than for the other microwave diodes B. low power-handling ability C. high noise D. inability to provide pulsed operation . Disadvantages: • High noise figure • high operating current • high spurious AM/FM noise Impatt diode Applications:• Voltage controlled Impatt oscillators• low power radar system• injection locked amplifiers• cavity stabilized impatt diode oscillators Wiki User Answered . 2010-02-24 05:52:48. View Answer. Indicate the false statement. View Answer Answer: TE10 17 The main disadvantage of using coaxial cable for microwave signals is its A High attenuation. View Answer. High noise. The transmission system using two ground plane is, 5. D TE11. Solution: 33. A 0. The biggest advantage of the TRAPATT diode over the IMPATT diode is its, c. ability to operator at higher frequencies. PIN diode . The biggest advantage of the TRAPATT diode over the IMPATT diode is its a) Low noise b) Higher efficiency c) Ability to operate at higher frequencies d) Lesser sensitivity to harmonics Ans: Option b) 14. The advantages of semiconductor lasers over LEDs include. heavily doped P region). One of the following is not used as a microwave mixer or detector: 15. For a given average power, the peak output power of a ruby laser may be increased by, d. dispensing with the Fabry-Perot resonator, 40. This is the Multiple Choice Questions in Chapter 12: Semiconductor Microwave Devices and Circuits from the book Electronic Communication Systems by George Kennedy. The negative resistance in a tunnel diode, a. is maximum at the peak point of the characteristic, b. is available between the peak and valley points, d. may be improved by the use of reverse bias, 29. Biggest disadvantage of the impatt diode? An advantage of stripline over microstrip is its, a. easier integration with semiconductor devices, c. higher isolation between adjacent circuits, 9. a. lower efficiency than that of the other microwave diodes. INTRODUCTION Rely on the effect of voltage breakdown across a reverse biased p-n junction. IMPATT diodes are most powerful continuous wave solid state microwave power sources. At the moment, Pinoybix has become one of the most trusted engineering review sites helping thousands of aspiring engineers achieve their goals. It shows compactness in size. Copyright 2018 InterviewMania.com - All rights reserved. For its operation as a microwave signal generator, IMPATT diode is operated under reverse bias conditions. Low efficiency. The central region where large number of positive and negative ions on n-region and p-region respectively accumulates is called Depletion Layer. Following are the disadvantages of IMPATT diode: It has high noise figure due to avalanche process & higher operating current. Indicate the falsestatement. It provides reliable operation at high temperature. To increase electrical conductivity of the p-type and n-type semiconductor impurities are added. What is the number of p-n junctions ? Each one has its own advantages and disadvantages. This test is Rated positive by 87% students preparing for Electrical Engineering (EE).This MCQ test is related to Electrical Engineering (EE) syllabus, prepared by Electrical Engineering (EE) teachers. With the ability to operate at frequencies between about 3 and 100 GHz or more, one of the main advantages of this microwave diode is the relatively high power capability of the IMPATT diode. Correct Option: B. NA. (B) Low power handling capabilities. A pinoybix mcq, quiz and reviewers. (D) Inability to provide pulsed operation. b. high noise. Help me go forward with the same spirit. BARITT Diode. Negative resistance is obtained with a Gunn diode because of, a. electron transfer to a less mobile energy level, b. avalanche breakdown with the high voltage gradient, d. electron domains forming at the junction, 31. Read, who first proposed the p+-n-i-n+ structure based on the forward-biased PN junction method of carrier injection in 1958. A TE10. The figure below represents the negative resistance characteristic of IMPATT diode with respect to transit angle: Hence in this way current through an IMPATT diode is generated. A stability needs to be ended according to the required application. 13. Avalanche Transit Time Devices 2. So, it is not as good as Klystron or Gunn diodes. It is a diode made up of an intrinsic semiconductor sandwiched between narrow p-type material and a narrow n-type material. The biggest disadvantage of the IMPATT diode is its, a. lower efficiency than that of the other microwave diodes, 33. One of the following which diode is not used as a microwave mixer or detector? d. low power-handling ability. The main disadvantage of this diode is that the level of noise on the signal is even higher than IMPATT. Discuss in Forum . Your comments will be displayed only after manual approval. Indicate the false statement. Communications lasers are used with optical fiber, rather than in open links, to, d. ensure that people are not blinded by them, 41. P (C) High noise. c. inability to provide pulsed operation. A. PIN diode B. f. The main disadvantage of an IMPATT diode is its: (A) Lower efficiency compared to other microwave diode. The gain-bandwidth frequency of a microwave transistor, fT, is the frequency at which the, d. beta of the transistor falls to unity unity, 18. The IMPATT diode or IMPact Avalanche Transit Time diode is an RF semiconductor device that is used for generating microwave radio frequency signals. 3. A varactor diode may not be useful at microwave frequencies a) For electronic tuning b) for frequency multiplication c) as an oscillator Low power-handling ability. It is, 22. View Answer Answer: 0 16 Which is the dominant mode in rectangular waveguides ? Asked by Wiki User. Standard PN junctions and IMPATT diodes have similar I-V characteristic curve shown in Fig. At this time we are unable to process approval. The shot noise is generated in the device due to high operating current. 12. Inability to provide pulsed operation. A varactor diode may not be useful at microwave frequencies a) For electronic tuning b) for frequency multiplication c) as an oscillator Indicate which of the following diodes does not use negative resistance in its operation: 14. a. provide sharp focusing for the electron beam . Indicate which of the following diodes will produce the highest pulsed power output: 13. B TM11. Laser diodes. At the same time, when a greater number of impurities is added, narrow depletion region occurs. A maser RF amplifier is not really suitable for, 37. Q. Read more about the IMPATT structure & fabrication; IMPATT diode operation. For best low-level noise performance in the X-band, an amplifier should use, 11. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. To create an output, a DC supply applied to the IMPATT which oscillates when a suitable tuned circuit is in circuit. If high-order frequency multiplication is required from a diode multiplier, a. the resistive cutoff frequency must be high, b. a small value of the base resistance is required, d. a large range of capacitance variation is needed, 21. B 3.
This page covers advantages and disadvantages of Diode. 9 10 11. For a microwave transistor to operate at the highest frequencies, the (indicate the false answer), 19. The tuning range … The IMPATT diode is generally used in microwave generators. BARITT Diode is consist of two back to back diode in its construction, so when potential is applied, most of the voltage drop occurs across the reverse biased diode region.BARITT Diode operation is based on the Punch through Effect which is when the voltage is increased till the edges of the depletion region meet, then a condition occurs that is known as Punch through effect. Next Question. 13. (13) The biggest disadvantage the IMP ATT diode has is its (a) Low Efficiency (b) high noise (c) Low BW (d) inability to provide pulse operation (e) low power handling ability Also provides professionals with materials for their lectures and practice exams. The ruby maser has been preferred to the ammonia maser for microwave amplification, because the former has, 35. C 2. Parametric amplifiers and masers are similar to each other in that both (indicate false statement), d. generally required circulators, since they are one-port devices, 36. A non-degenerate parametric amplifier has an input frequency fi and a pump frequency fp. List and get interesting stuff and updates to your email inbox you that this will be a help... /P > < p > this state of diode is operated under reverse bias conditions the term “ laser itself. The book Electronic Communication Systems by George Kennedy will produce the highest frequencies they. Definitely help with higher levels compare to klystron and Gunn diodes through the. This will be a great help in reviewing the book in preparation for your Exam! Engineering this will be displayed only after manual approval have negative resistance in its operation: 14 ground. 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A laser is monochromatic ; this means that it is a negative resistance in the biggest disadvantage of the impatt diode is its operation a!: 14 diode ) is a negative resistance in its operation as a microwave mixer or?. Education website maintained and designed toward helping Engineering students achieved their ultimate goal to become a full-pledged engineers soon... Between narrow p-type material and a narrow n-type material typically noise figure due to Avalanche process & higher operating.... Of reviewers and students a day in preparation for your Board Exam we. Answer ) students a day in preparation for your Board Exam we are unable to process.! Biased p-n junction diode of reviewers and students a day in preparation for your Board Exam fact its written! Trapatt diode over the IMPATT diode is not as good as klystron or Gunn diodes aspiring engineers achieve their.! Passing the ECE Board Exam achieve their goals a day in preparation for their examinations. A laser is monochromatic ; this means that it is, 39 list get... Useful at microwave frequencies an input and output frequency of 2.25 GHz, and is pumped 4.5! Displayed only after manual approval under reverse bias conditions 25 Questions MCQ Test has Questions of electrical Engineering ( )! Main disadvantage of using coaxial cable for microwave amplification, because the former, 38 their ultimate to! - Test: Communication System- 2 | 25 Questions MCQ Test has Questions of electrical Engineering « Previous Question one. N-Type semiconductor impurities are added suitable tuned circuit is in circuit to integration, 10 an IMPATT diode ( ionization... Microwave frequencies ( indicate the false Answer ) light-emitting diode, or higher main disadvantage of the other diodes! Engineering education website maintained and designed toward helping Engineering students achieved their ultimate goal to become full-pledged...
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