Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide In cases where the data file or ideal component types are used, the Sonnet solver uses a circuit simulation technique to produce the combined results. Since this is a post EM analysis step, the user can change the ideal component value, or associated S-parameter data file, without requiring a new EM analysis; only the circuit simulation part of the analysis is performed by the analysis engine. Please note that the coupling from the inside of the component to the rest of the circuit is not considered in the Sonnet analysis. Only the coupling from the component’s terminals is considered. When connecting external parts to your EM structure, we highly recommend that you use either the co-calibrated ports or the Component feature. This novel approach provides greatly enhanced accuracy for this application by perfectly deembedding the ports, thus completely removing all coupling between them. Autogrounded Ports have the limitation of not removing any port to port coupling. Before proceeding to use the Component feature, it would be helpful to become familiar with the related co-calibrated internal ports discussed in “Co-calibrated Internal Ports,” page 70 in the Ports chapter. Component Assistant When you select any of the Add Component commands in the project editor, the Component Assistant appears on your display. Whenever you select a control in the Component Properties dialog box, the assistant provides a description of the field, and often, an illustration of the principle, so that you may select the correct setting and model your Component more accurately. If the Component Assistant does not appear, you should select the “Use Component/Calibration Group Assistant” checkbox on the Hints tab of the Preferences dialog box in the project editor (File ⇒ Preferences). Anatomy of a Component The Component is represented in your circuit by a component symbol. The label of the Component appears above the component symbol and the terminal numbers are identified there. Ports, indicating where the terminals of the Component are 82
Chapter 6 Components connected to the metal in your circuit, are represented by a small rectangle. Component ports are only numbered when the Component model type is Ports Only. An example of a Component as it appears in the project editor is shown below. Physical Size Port Label Metal Polygon Open Polygon Edge Component Symbol Terminal Number Component Symbol Port Terminal Numbers This is the symbol which represents your Component in your project. The Component port defines the point at which the Component is connected to the circuit metal and must be attached to an open polygon edge. This point also serves as a reference plane for de-embedding the Component unless a reference plane is added for the port. There is one Component port for each terminal on the Component. Component ports are modeled using co-calibrated internal ports. For more information on co-calibrated ports, please see “Co-calibrated Internal Ports,” page 70. Terminal numbers identify the physical pin on your Component connected to the corresponding Component port. Components may have an unlimited number of terminals, with the exception of those Components which use the Ideal Component model, since the available ideal components are limited to two terminals. Terminals and/or ports are numbered in the order in which they are added to your circuit and may be modified after the Component is added to your circuit. Label Open Polygon Edge The label is user-defined text which identifies the Component in your circuit. Each Component label in a project must be unique. Component ports may be placed only on open polygon edges. You may use a reference plane to control how much, if any, of your circuit metal is also de-embedded in addition to the Component. For more information, see “Reference Planes,” page 91. 83
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