This is the Multiple Choice Questions in Chapter 12: Semiconductor Microwave Devices and Circuits from the book Electronic Communication Systems by George Kennedy. They operate at frequencies of about 3 and 100 GHz, or higher. Previous Question The biggest disadvantage of the IMPATT diode is its: Lower efficiency than that of the other microwave diodes. One of the following is not used as a microwave mixer or detector: 15. 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. This diode is used in the microwave signal generation like the … INTRODUCTION Two distinct modes of avalanche oscillator is … Biggest disadvantage of the impatt diode? Laser diodes. 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 laser diode is a further development upon the regular light-emitting diode, or LED. The transferred-electron bulk effect occurs in, 17. 12. A 0. At this time we are unable to process approval. 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. 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. The main advantage is their high-power capability; single IMPATT diodes … Indicate which of the following diodes will produce the highest pulsed power output: 13. INTRODUCTION Rely on the effect of voltage breakdown across a reverse biased p-n junction. inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. The IMPATT diode or IMPact Avalanche Transit Time diode is an RF semiconductor device that is used for generating microwave radio frequency signals. d. low power-handling ability. 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. The IMPATT diode is generally used in microwave generators. 1a. What is the number of p-n junctions ? (C) High noise. A varactor diode may be useful at microwave frequencies (indicate the false answer). 0 0 1 0 0 0 0. IMPATT diodes are most powerful continuous wave solid state microwave power sources. P Home » Communications » Questions and Answers » Kennedy Questions and Answers ». Indicate the false statement. A TE10. Indicate the falsestatement. 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. (B) Low power handling capabilities. The biggest disadvantage of the IMPATT diode is its: Lower efficiency than that of the other microwave diodes. Drawbacks or disadvantages of IMPATT diode. Asked by Wiki User. Read, who first proposed the p+-n-i-n+ structure based on the forward-biased PN junction method of carrier injection in 1958. It provides high operating range. On a historical note, IMPATT diode is also called ‘Read’ diode in honor of W.Т. C TM01. Discuss in Forum . It shows compactness in size. Traveling-wave parametric amplifiers are used to, b. reduce the number of varactor diodes required, 24. Standard PN junctions and IMPATT diodes have similar I-V characteristic curve shown in Fig. 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. A varactor diode may not be useful at microwave frequencies a) For electronic tuning b) for frequency multiplication c) as an oscillator A varactor diode may not be useful at microwave frequencies a) For electronic tuning b) for frequency multiplication c) as an oscillator The biggest disadvantage of the IMPATT diode is its A. low efficiency than the other microwave diodes B. low power handling ability C. high noise D. inability to provide pulsed operation . Breakdown occurs in the region very close to the P+ (i.e. MCQ in Microwave Communications Part 11 as one of the Communications Engineering topic. a. provide sharp focusing for the electron beam . The particle current and the AC voltage in a diode are expanded into Fourier series, and their harmonic components are related with each other by the corresponding impedances of the harmonic-frequency circuits. The IMPATT diode or IMPact ionisation Avalanche Transit Time diode is an RF semiconductor device that is used for generating microwave radio frequency signals. The transmission system using two ground plane is, 5. 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 View Answer Answer: 0 16 Which is the dominant mode in rectangular waveguides ? 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