Inductor
An inductor is a passive electrical component that includes a series of conductive windings or coils which cooperate to define the magnetic field in a specified region when an electric current is established in the turns. Inductors often comprise a magnetic core composed of an iron or ferrite material that is wound with a conductive coil. Consequently, inductors are often referred to as wire-wound coil devices. An inductor is divided into a wire wound type and a stacked type, each having different application fields and fabrication methods. In a wire wound type inductor, a coil is wound on a base body such as a magnetic material, etc. In this case, as the number of windings increases in order to get a high inductance, the high frequency characteristic deteriorates based on the increased number of windings, because a stray capacitance is present between the wound coils. Inductors can be wound around cores having a variety of shapes ranging from simple cylindrical rods to donut-shaped toroids. Toroids are known to provide certain advantages since, for a given core material and number of turns, they provide a higher inductance as compared to solenoidal cores. Toroids also have the advantage of substantially containing the magnetic field produced by the inductor within the core region so as to limit RF leakage and avoid coupling and interference with other nearby components. In a stacked type inductor, a base body is the same as the wire wound type inductor, but green sheets having internal electrodes printed as a spiral shape are stacked instead of a wound coil. Pressurization and sintering are performed on the stacked green sheets, and an external electrode is placed at both ends of the base body. Inductors perform a wide variety of essential functions in many electronic devices. For example, inductors are used in power supplies as choke coils, for energy storage and to minimize noise and AC ripple. Inductors are also used in transformers to change voltage level and to provide isolation. High current, low profile inductors and transformers are widely used in diverse applications in the fields of telecommunications, power conversion, and digital data circuits. Such electrical components most frequently employ ferromagnetic cores and shields. Inductors used in integrated circuits are typically mounted on a substrate of the integrated circuit. An inductor typically comprises conducting material formed in a straight line or spiral shape with magnetic material positioned in close proximity. In recent integrated circuit chip design, it is often desired to provide passive electrical devices such as inductors directly on the chip as part of the integrated circuit. By comparison with the usual discrete wired inductors, chip inductors are physically smaller, can be manufactured at less expense, and are more suitable for use in automatic insertion machines for circuit boards.
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