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As you recall, any transmission line has a characteristic impedance, or Zo, that depends on the line construction. This property is sometimes used to make impedance transformers out of coaxial or parallel-wire line. Transmission-line transformers are always made from quarter-wave sections. From the previous chapter, remember the formula for the length of a quarter-wave section, that is,

Refer to the text in this chapter if necessary. A good score is at least 18 correct. Answers are in the back of the book. 1. The term semiconductor arises from (a) resistor-like properties of metal oxides. (b) variable conductive properties of some materials. (c) the fact that electrons conduct better than holes. (d) insulating properties of silicon and GaAs. 2. Which of the following is not an advantage of semiconductor devices over vacuum tubes (a) Smaller size (b) Lower working voltage

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The second factor that affects the degree of material dispersion is a characteristic called the center operating wavelength of the source signal. In the vicinity of 850 nm, red, longer wavelengths travel faster than their shorter blue counterparts, but at 1550 nm, the situation is the opposite: blue wavelengths travel faster. Of course, the two meet at a point and share a common minimum dispersion level; it is in the range of 1310 nm, often referred to as the zero-dispersion wavelength. Clearly, this is an ideal place to transmit data signals, since dispersion effects are minimized here. As we will see later, however, other factors crop up that make this a less desirable transmission window than it appears. Material dispersion is a particularly vexing problem in single-mode fibers.

where Lft is the length of the section in feet, v is the velocity factor expressed as a fraction, and fo is the frequency of operation in megahertz. If the length Lm is in meters, then: Lm 75v/fo

(c) Lighter weight (d) Ability to withstand high voltage spikes 3. Of the following substances, which is the most commonly used semiconductor (a) Germanium (b) Galena (c) Silicon (d) Copper 4. GaAs is (a) a compound. (b) an element. (c) a mixture. (d) a gas. 5. A disadvantage of MOS devices is the fact that (a) the charge carriers move fast. (b) the material does not react to ionizing radiation. (c) they can be damaged by electrostatic discharges. (d) they must always be used at high frequencies. 6. Selenium works especially well in (a) photocells. (b) high-frequency detectors. (c) RF power amplifiers. (d) voltage regulators. 7. Of the following, which material allows the lowest forward voltage drop in a diode (a) Selenium (b) Silicon (c) Copper (d) Germanium 8. A CMOS integrated circuit (a) can only work at low frequencies. (b) requires very little power to function. (c) requires considerable power to function. (d) can only work at high frequencies. 9. The purpose of doping is to (a) make the charge carriers move faster. (b) cause holes to flow.

In the last chapter, you saw how a short circuit is changed into an open circuit, and vice versa, by a quarter-wave section of line. What happens to a pure resistive impedance at one end of such a line What will be seen at the opposite end Let a quarter-wave section of line, with characteristic impedance Zo, be terminated in a purely resistive impedance Rout. Then the input impedance is also a pure resistance Rin , and the following relationship holds: Zo2 RinRout

slightly different indices of refraction, the light that travels in the core moves slightly slower than the light that escapes into and travels in the cladding. This results in a dispersion effect that can be corrected by transmitting at specific wavelengths where material and waveguide dispersion actually occur at a minimum.

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