A novel method for designing controlled impedance transmission lines for high-speed digital systems is introduced. The method requires specification of the desired electrical performance, some device parameters, and the desired characteristic impedance (Z/sub 0/). By following this procedure, the minimum and maximum Z/sub 0/ values that meet electrical performance and the useful tolerances on the nominal Z/sub 0/ are maximized. The value of the termination resistor that maximizes the tolerances on Z/sub 0/ is also obtained. In the ideal case of transmission line termination, the termination resistor matches the line impedance. In the practical case, the optimum series termination resistor for high-speed digital systems is less than the nominal line impedance. The optimum parallel termination resistor will have a higher value than the nominal line impedance.
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机译：介绍了一种用于高速数字系统的受控阻抗传输线设计的新方法。该方法需要指定所需的电气性能，一些设备参数和所需的特性阻抗（Z / sub 0 /）。通过遵循此过程，可以最大程度地满足电气性能的最小和最大Z / sub 0 /值以及标称Z / sub 0 /的有用公差。还可以获得使Z / sub 0 /上的公差最大化的端接电阻器的值。在传输线终端的理想情况下，终端电阻与线路阻抗匹配。在实际情况下，用于高速数字系统的最佳串联终端电阻小于标称线路阻抗。最佳并联终端电阻器的值将比标称线路阻抗高。
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