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drawing of a capacitor consisting of two meshed sets of several metal plates, separated by layers of dielectric material.
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Capacitance values for plastic-film units range from about 50 pF to several tens of microfarads. Most often they are in the range of 0.001 F to 10 F. Plastic capacitors are employed at AF and RF, and at low to moderate voltages. The efficiency is good, although not as high as that for micadielectric or air-dielectric units.
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Electrolytic Capacitors All of the aforementioned types of capacitors provide relatively small values of capacitance. They are also nonpolarized, meaning that they can be hooked up in a circuit in either direction. An electrolytic capacitor provides greater capacitance than any of the preceding types, but it must be connected in the proper direction in a circuit to work right. An electrolytic capacitor is a polarized component. Electrolytic capacitors are made by rolling up aluminum foil strips, separated by paper saturated with an electrolyte liquid. The electrolyte is a conducting solution. When dc flows through the component, the aluminum oxidizes because of the electrolyte. The oxide layer is nonconducting, and forms the dielectric for the capacitor. The layer is extremely thin, and this results in a high capacitance per unit volume. Electrolytic capacitors can have values up to thousands of microfarads, and some can handle thousands of volts. These capacitors are most often seen in AF circuits and in dc power supplies. Tantalum Capacitors Another type of electrolytic capacitor uses tantalum rather than aluminum. The tantalum can be foil, as is the aluminum in a conventional electrolytic capacitor. It can also take the form of a porous pellet, the irregular surface of which provides a large area in a small volume. An extremely thin oxide layer forms on the tantalum. Tantalum capacitors have high reliability and excellent efficiency. They are often used in military applications because they almost never fail. They can be used in AF and digital circuits in place of aluminum electrolytics. Semiconductor Capacitors Later in this book, you ll learn about semiconductors. These materials have revolutionized electrical and electronic circuit design in the past several decades. Semiconductor materials can be employed to make capacitors. A semiconductor diode conducts current in one direction, and refuses to conduct in the other direction. When a voltage source is connected across a diode so that it does not conduct, the diode acts as a capacitor. The capacitance varies depending on how much of this reverse voltage is applied to the diode. The greater the reverse voltage, the smaller the capacitance. This makes the diode act as a variable capacitor. Some diodes are especially manufactured to serve this function. Their capacitances fluctuate rapidly along with pulsating dc. They are called varactor diodes or simply varactors. Capacitors can be formed in the semiconductor materials of an integrated circuit (also called an IC or chip) in much the same way. Sometimes, IC diodes are fabricated to serve as varactors. Another way to make a capacitor in an IC is to sandwich an oxide layer into the semiconductor material, between two layers that conduct well. Most ICs look like little boxes with protruding metal prongs (Fig. 11-7). The prongs provide the electrical connections to external circuits and systems. Semiconductor capacitors usually have small values of capacitance. They are physically tiny, and can handle only low voltages. The advantages are miniaturization and an ability, in the case of the varactor, to change in value at a rapid rate.
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11-7 A typical integratedcircuit package is a tiny plastic box with protruding metal pins.
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The capacitance of a component can be varied at will by adjusting the mutual surface area between the plates, or by changing the spacing between the plates. The two most common types of variable capacitors (besides varactors) are the air variable and the trimmer. You will also sometimes encounter coaxial capacitors.
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Air Variables By connecting two sets of metal plates so that they mesh, and by affixing one set to a rotatable shaft, a variable capacitor is made. The rotatable set of plates is called the rotor, and the fixed set is called the stator. This is the type of component you might have seen in older radio receivers, used to tune the frequency. Such capacitors are still used in transmitter output tuning networks. Figure 11-8 is a functional drawing of an air-variable capacitor. Air variables have maximum capacitance that depends on the number of plates in each set, and also on the spacing between the plates. Common maximum values are 50 to 500 pF; minimum values are a few picofarads. The voltage-handling capability depends on the spacing between the plates. Some air variables can handle many kilovolts. Air variables are used primarily in RF applications. They are highly efficient, and are nonpolarized, although the rotor is usually connected to common ground (the chassis or circuit board).
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