Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide When you select user defined, your terminal width is defined based on the location of the Component port. The point at which the port is placed on the polygon edge becomes the center of the terminal width extending an equal distance on either side. This ability to limit the terminal width size is important in cases where more than one Component port needs to connect to the same polygon edge or the polygon edge is extremely large. The next two images demonstrate these concepts. The component has two terminals connected to a single polygon edge. The cell size is 2 mils and the user-defined terminal width is 8 mils as shown. Terminal Width A coplanar waveguide that uses a two port component. To the right is shown the entry in the Component Properties dialog box. 90
Chapter 6 Components Reference Planes Components require their ports to be on open polygon edges. Reference Planes can be used to effectively move your port position away from the polygon edge. To accomplish this, em uses circuit theory to cascade a negative length of the line with the analysis results. If no reference plane is specified, then de-embedding the Component removes none of the feedline metal but the port(s) are still de-embedded. The use of reference planes is illustrated below. NOTE: Reference planes may only be used when the ground node connection is defined as the Sonnet box. All the Component ports on a side of a Component use the same reference plane. For a detailed discussion of reference planes and de-embedding, please see Chapter 7, “De-embedding” on page 97. As with all Sonnet reference planes, the Component reference planes are snapped to the grid. It is important that you are working with a fine enough cell size to ensure the accurate placement of your reference planes. If the length is set to less than one half the cell size, then the reference plane will not be displayed in the project editor window. Calibration Lengths The analysis engine will automatically determine appropriate lengths for the calibration standards used in the de-embedding algorithm. Normally, the Auto setting (default) produces efficient and highly accurate simulation results. In rare cases, you may wish to manually override the automatic lengths. Before manually overriding these settings, please be sure to read Chapter 8, “De-embedding Guidelines” on page 107. 91
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