read barcode scanner in c#.net DESIGNING FOR EMBEDDED COMPONENT APPLICATIONS in Software

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DESIGNING FOR EMBEDDED COMPONENT APPLICATIONS
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Resistors Resistors were the first component to be embedded in a multilayer board, making it a truly three-dimensional interconnection and circuit system. While early designs were custom for
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each applicaton, over time design standards and best practices have been developed, which allow for successful inclusion of resistors, and other components, without the need to start from the beginning. The following discussion provides these for resistors, with subsequent sections providing similar information for other components. 21.4.1.1 Resistor Terminology. The designer must size embedded formed passive resistors. This is in contrast to the library selection of conventionally manufactured resistors that are selected from a table of available components. The principle of embedded resistors is given by the following formula for a term ohms per square; this means that any square area defined in the material will have the same resistance and that by grouping squares appropriately, the designer can define the resulting resistance. Resistance in any resistor is determined by Eq. 21.1 R = r L/A where R = resistance in ohms r = resistivity in ohm meters (inches) L = length of the resistor A = cross-sectional area (resistor thickness times resistor width) Note: Resistivity (r) is a material property. It is a constant at a given temperature and expressed in resistance units (ohms) for area and length. For instance, the resistivity of copper is r = 7.09 e 7 ohm in.2/in. Sheet resistance is a commonly used term to describe raw materials used in embedded formed resistors. These materials are manufactured in sheet form with a constant thickness, giving a uniform R value for any square resistor. Therefore, the material is specified by its sheet resistance value, given in ohms/square ( / ). The resistance of a specific resistor is simply designed by changing the ratio of length to width. For instance, 100 / material forms a 100 ohm resistor in any square configuration. A resistor three squares long by one square wide would be 300 , and a resistor two squares wide by one square long would be 50 . 21.4.1.2 Resistor Design Parameters. The circuit board designer is responsible for sizing the resistor to give the appropriate value. Material suppliers have given their sizing parameters to computer-aided design (CAD) software companies for entry in their component libraries. Also, manufacturing tolerances for each supplier product have been communicated to computer-aided manufacturing (CAM) suppliers. Figure 21.2 gives typical design parameters for sizing both the active embedded formed resistor area and the termination pads for the traditional copper innerlayer upon which the resistor is built. (Eq. 21.1)
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Capacitor Design All production formed capacitors use laminate-like materials. Most typically, the capacitor manufacturer starts with an especially flat copper foil on at least one side. This copper foil is precisely coated with the dielectric material: filled polymer. Either the top foil electrode is then laminated or two layers of coated foil are bonded polymer to polymer. 21.4.2.1 Capacitor Terminology. Capacitors are electrical elements that store charge on parallel electrode plates. They are not batteries that operate chemically. Capacitors store more charge with closer parallel plates, and the higher the dielectric constant, the more charge is stored.
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LW Pw Print width PL Print length RW Resistor width RL Resistor length TW Termination width LW Line width EZ Encapsulant zone (CTF only)
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EZ PW TW Embedded passives-designing for the future
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FIGURE 21.2 Resistor terminations.
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Again, the value of embedded capacitors must be designed to the correct size. The value of a formed embedded capacitor is given by the Eq. 21.2. C = A Dk K/t where C is the value of the capacitor A is the area of the formed planar capacitor L W Dk is the dielectric constant of the capacitor material t is the thickness between the capacitor plates K is a conversion constant = 8.854 10 14 Farads/cm 21.4.2.2 Capacitor Design Parameters. Similar design tolerancing for capacitor design parameters (compared to resistors in Sec. 24.4.1) is available for capacitors, as shown in Fig. 21.3. (21.2)
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