the biggest disadvantage of the impatt diode is its

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 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. The output from a laser is monochromatic; this means that it is, 39. A maser RF amplifier is not really suitable for, 37. IMPATT diode. Indicate the false statement. 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. Biggest disadvantage of the impatt diode? Avalanche Transit Time Devices 2. 9 10 11. This diode is used in the microwave signal generation like the … INTRODUCTION Two distinct modes of avalanche oscillator is … These diodes are used in a variety of applications from low power radar systems to alarms. IMPATT diode I-V characteristic . Biggest problem with IMPATT diode is hsot noise. 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. Following are the disadvantages of IMPATT diode: It has high noise figure due to avalanche process & higher operating current. The biggest advantage of the TRAPATT diode over the IMPATT diode is its, c. ability to operator at higher frequencies. Subscribe to our mailing list and get interesting stuff and updates to your email inbox. The avalanche diode oscillator uses carrier impact ionization and drift in the high field region of a semiconductor junction to produce a negative resistance at microwave frequencies. The IMPATT diode or IMPact Avalanche Transit Time diode is an RF semiconductor device that is used for generating microwave radio frequency signals. Laser diodes. The ruby laser differs from the ruby maser in that the former, 38. 1a. It provides high operating range. Traveling-wave parametric amplifiers are used to, b. reduce the number of varactor diodes required, 24. The magnetic field is used with a ruby maser to, a. provide sharp focusing for the electron beam, 34. View Answer. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam. A wide and big depletion region is formed when a smaller number of impurities is added to p-n junction diode. For its operation as a microwave signal generator, IMPATT diode is operated under reverse bias conditions. C 2. d. low power-handling ability. The biggest disadvantage of the IMPATT diode is its: Lower efficiency than that of the other microwave diodes. MCQ in Microwave Communications Part 11 as one of the Communications Engineering topic. A. PIN diode B. 13. One of the following is not used as a microwave mixer or detector: 15. C TM01. Also provides professionals with materials for their lectures and practice exams. An advantage of stripline over microstrip is its, a. easier integration with semiconductor devices, c. higher isolation between adjacent circuits, 9. 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 shot noise is generated in the device due to high operating current. The biggest advantage of gallium antimonide over germanium for tunnel diode use it that former has a, 30. Large-signal analysis of an IMPATT diode is presented, where the effect of harmonic-frequency circuits is included. The non-degenerate one-port parametric amplifier should have a high ratio of pump to signal frequency because this, a. permits satisfactory high frequency operation, a. has a tiny hole through its center to facilitate tunneling, b. is a point-contact diode with a very high reverse resistance, c. uses a high doping level to provide a narrow junction, d. works by quantum tunneling exhibited by gallium arsenide only, 27. Low power-handling ability. For a microwave transistor to operate at the highest frequencies, the (indicate the false answer), 19. A tunnel diode is loosely coupled to its cavity in order to, b. increase the available negative resistance, d. allow operation at the highest frequencies, 28. 20. D TE11. B TM11. Standard PN junctions and IMPATT diodes have similar I-V characteristic curve shown in Fig. Solution: 33. Typically noise figure of IMPATT is about 30 dB. To increase electrical conductivity of the p-type and n-type semiconductor impurities are added. It also has very high levels of harmonics as a result of the short current pulses that are used. A major drawback of using IMPATT diodes is the high level of phase noise they generate. The advantages of semiconductor lasers over LEDs include. An advantage of stripline over waveguide is its, d. greater compatibility with solid-state devices, 6. It shows compactness in size. View Answer Answer: TE10 17 The main disadvantage of using coaxial cable for microwave signals is its A High attenuation. The laser diode is a further development upon the regular light-emitting diode, or LED. Choose the letter of the best answer in each questions. 2010-02-24 05:52:48. IMPATT diodes are economical. 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. Schottky Diode. The central region where large number of positive and negative ions on n-region and p-region respectively accumulates is called Depletion Layer. c. inability to provide pulsed operation. At the same time, when a greater number of impurities is added, narrow depletion region occurs. Low efficiency. Indicate the falsestatement. PIN diode . Copyright 2018 InterviewMania.com - All rights reserved. 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. They have negative resistance and are used as oscillators and amplifiers at microwave frequencies. Discuss in Forum . Top Answer. The Biggest Disadvantage the IMPATT Diode has is its (A) Low Efficiency (B) High Noise (C) Low BW (D) Inutility to provide Pulse Operation. The magnetic field is used with a ruby maser to. Although the TRAPATT diode provides a much higher level of efficiency than the IMPATT, its major disadvantage is that the noise levels on the signal are even higher than they are when using an IMPATT. 38. 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 IMPATT diodes are most powerful continuous wave solid state microwave power sources. Drawbacks or disadvantages of IMPATT diode. At this time we are unable to process approval. a. provide sharp focusing for the electron beam . The IMPATT diode or IMPact ionisation Avalanche Transit Time diode is an RF semiconductor device that is used for generating microwave radio frequency signals. 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. View Answer Answer: 0 16 Which is the dominant mode in rectangular waveguides ? The tuning range … Q. 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. So, it is not as good as Klystron or Gunn diodes. A TE10. It has very small interelectrode capacitances. heavily doped P region). 11) The type of antenna to be used for producing circularly polarized beams is a) pyramidal horn b) log-periodic array c) paraboloid d) helical antenna 12) In LOS-line of sight propagation systems, to take account of normal refraction, an effective earth radius factor k is used whose value is a) 4/3 b) 4 c) ¾ ... Read more Microwave Engineering MCQ Questions Answers Electronics ECE It is a diode which also has a negative resistance wherein the applied voltage is 180 degrees out of phase with the current. Disadvantages P Previous Question Asked by Wiki User. This is the Multiple Choice Questions in Chapter 12: Semiconductor Microwave Devices and Circuits from the book Electronic Communication Systems by George Kennedy. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam.

This state of diode is known as forward biased state. The negative resistance in a BARITT diode is obtained on account of the drift of the injected holes to the collector end of the diode, made of p-type material. These are set so that avalanche breakdown occurs. (D) Inability to provide pulsed operation. B 3. INTRODUCTION Rely on the effect of voltage breakdown across a reverse biased p-n junction. A disadvantage of microstrip compared with stripline is that microstrip, a. does not readily lend itself to printed circuit techniques, d. is more expensive and complex to manufacture, 4. Help me go forward with the same spirit. (B) Low power handling capabilities. 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. Next Question. a. lower efficiency than that of the other microwave diodes. It is, 22. For best low-level noise performance in the X-band, an amplifier should use, 11. Your comments will be displayed only after manual approval. They operate at frequencies of about 3 and 100 GHz, or higher. Pinoybix.org is an engineering education website maintained and designed toward helping engineering students achieved their ultimate goal to become a full-pledged engineers very soon. Jan 07,2021 - Test: Communication System- 2 | 25 Questions MCQ Test has questions of Electrical Engineering (EE) preparation. A parametric amplifier sometimes uses a circulator to, b. allow the antenna to be used simultaneously for transmission and reception, c. separate the signal and idler frequencies, 25. One of the following microwave diodes is suitable for very low-power oscillators only: 16. (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 For Gunn diodes, gallium arsenide is preferred to silicon because the former, a. has a suitable empty energy band, which silicon does not have, c. has a lower noise at the highest frequencies, d. is capable of handling higher power densities, 32.

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