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factor is the capacitance at the P-N junction during conditions of reverse bias. As the junction capacitance of a diode increases, maximum frequency at which it can alternate between the conducting state and the nonconducting state decreases. The junction capacitance of a diode depends on several factors, including the operating voltage, the type of semiconductor material, and the cross-sectional area of the P-N junction. If you examine Fig. 19-5B, you might get the idea that the depletion region, sandwiched between two semiconducting sections, can play a role similar to that of the dielectric in a capacitor. This is true! In fact, a reverse-biased P-N junction actually is a capacitor. Some semiconductor components, called varactor diodes, are manufactured with this property specifically in mind. The junction capacitance of a diode can be varied by changing the reverse-bias voltage, because this voltage affects the width of the depletion region. The greater the reverse voltage, the wider the depletion region gets, and the smaller the capacitance becomes.

ferent wavelengths of light travel at different speeds through an optical fiber. To minimize this particular dispersion phenomenon, two factors must be managed. The first of these is the number of wavelengths that make up the transmitted signal. An LED, for example, emits a rather broad range of wavelengths between 30 and 180 nm, whereas a laser emits a much narrower spectrum, typically less than 5 nm. Thus, a laser s output is far less prone to be seriously affected by material dispersion than the signal from an LED.

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When calculating energy values, you must always remember the units you re using. In this case the unit is the watt hour, so you must multiply watts by hours. If you multiply watts by minutes, or watts by seconds, you ll get the wrong kind of units in your answer. That means a wrong answer! Sometimes, the curves in graphs like these are complicated. In fact, they usually are. Consider the graph of power consumption in your home, versus time, for a whole day. It might look something like the curve in Fig. 2-7. Finding the area under this curve is no easy task, if you have only this graph to go by. But there is another way to determine the total energy burned by your household in a day, or in a week, or most often, in a month. That is by means of the electric meter. It measures electrical energy in kilowatt hours. Every month, without fail, the power company sends its representative to read that meter. This person takes down the number of kilowatt hours displayed, subtracts the number from the previous month, and a few days later you get a bill. This meter automatically keeps track of total consumed energy, without anybody having to do sophisticated integral calculus to find the areas under irregular curves such as the graph of Fig. 2-7.

Avalanche Effect Sometimes, a diode conducts when it is reverse-biased. The greater the reverse-bias voltage, the more like an electrical insulator a P-N junction gets up to a point. But if the reverse bias rises past a specific critical value, the voltage overcomes the ability of the junction to prevent the flow of current, and the junction conducts as if it were forward-biased. This phenomenon is called the avalanche effect because conduction occurs in a sudden and massive way, something like a snow avalanche on a mountainside. The avalanche effect does not damage a P-N junction (unless the voltage is extreme). It s a temporary thing. When the voltage drops back below the critical value, the junction behaves normally again. Some components are designed to take advantage of the avalanche effect. In other cases, the avalanche effect limits the performance of a circuit. In a device designed for voltage regulation, called a Zener diode, you ll hear about the avalanche voltage or Zener voltage specification. This can range from a couple of volts to well over 100 V. Zener diodes are often used in voltage-regulating circuits. For rectifier diodes in power supplies, you ll hear or read about the peak inverse voltage (PIV) or peak reverse voltage (PRV) specification. It s important that rectifier diodes have PIV ratings great enough so that the avalanche effect will not occur (or even come close to happening) during any part of the ac cycle.

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