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Semiconductor materials 361 Gallium arsenide works better than silicon in several ways. It needs less voltage, and will function at higher frequencies because the charge carriers move faster. GaAs devices are relatively immune to the effects of ionizing radiation such as X rays and gamma rays. GaAs is used in light-emitting diodes, infrared-emitting diodes, laser diodes, visible-light and infrared detectors, ultra-high-frequency amplifying devices, and a variety of integrated circuits. The primary disadvantage of GaAs is that it is more expensive to produce than silicon.

Average Forward Current Electric current produces heat If the current through a diode is too great, the heat will destroy the P-N junction When designing a power supply, it is wise to use diodes with an Io rating of at least 15 times the expected average dc forward current If this current is 40 A, for example, the rectifier diodes should be rated at Io = 60 A or more Note that Io flows through the diodes The current drawn by the load is often different from this Also, note that Io is an average figure The instantaneous forward current is another thing, and can be 15 or 20 times the Io, depending on the nature of the filtering circuit Some diodes have heatsinks to help carry heat away from the P-N junction.

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Even though signals propagate significantly farther in optical fiber than they do in copper facilities, they are still eventually attenuated to the point that they must be regenerated In a traditional installation, the optical signal is received by a receiver circuit, converted to its electrical analog, regenerated, converted back to an optical signal, and transmitted onward over the next fiber segment This optical-to-electrical-to-optical conversion process is costly, complex, and time-consuming However, it is proving to be far less necessary as an amplification technique than it used to be because of true optical amplification that has recently become commercially feasible Please note that optical amplifiers do not regenerate signals; they merely amplify Regenerators are still required, albeit far less frequently Optical amplifiers represent one of the technological leading edges of data networking.

Selenium has resistance that varies depending on the intensity of light that falls on it. All semiconductor materials exhibit this property, known as photoconductivity, to a greater or lesser degree, but selenium is especially affected. For this reason, selenium is useful for making photocells. Selenium is also used in certain types of rectifiers. This is a device that converts ac to dc; you ll learn about rectification in chapters 20 and 21. The main advantage of selenium over silicon is that selenium can withstand brief transients, or surges of abnormally high voltage.

A selenium diode can be recognized by the appearance of its heatsink, which looks something like a baseboard radiator built around a steam pipe Diodes can be connected in parallel to increase the current rating over that of an individual diode When this is done, small-value resistors should be placed in series with each diode in the set to equalize the current Each resistor should have a value such that the voltage drop across it is about 1 V under normal operating conditions Peak Inverse Voltage The PIV rating of a diode is the instantaneous reverse-bias voltage that it can withstand without the avalanche effect taking place A good power supply has diodes whose PIV ratings are significantly greater than the peak ac input voltage If the PIV rating is not great enough, the diode or diodes in a supply conduct for part of the reverse cycle.

Pure germanium is a poor electrical conductor. It becomes a semiconductor when impurities are added. Germanium was used extensively in the early years of semiconductor technology. Some diodes and transistors still use it. A germanium diode has a low voltage drop (0.3 V, compared with 0.6 V for silicon and 1 V for selenium) when it conducts, and this makes it useful in some situations. But germanium is easily destroyed by heat. Extreme care must be used when soldering the leads of a germanium component.

Instead of the O-E-O process, optical amplifiers receive the optical signal, amplify it as an optical signal, and then retransmit it as an optical signal; no electrical conversion is required Like their electrical counterparts, however, they also amplify the noise; at some point, signal regeneration is required..

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