Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide 5 Enter the frequency band for the ABS in the Start and Stop text entry boxes. This completes setting up an ABS frequency sweep for the parameter sweep. You would also need to select the parameters which you want to use in the parameter sweep and enter their data ranges before closing this dialog box. Analysis Issues There are several issues you should be aware of before using the ABS technique; these are covered below. Multiple Box Resonances You should be aware that circuits with multiple box resonances make it difficult for an ABS analysis to converge. The frequency band for an adaptive sweep should not contain multiple box resonances. If multiple box resonances are present the number of discrete full analysis points goes up dramatically and synthesis of the data becomes very difficult. If you do not know how to identify box resonances, see Chapter 22, “Package Resonances” for a detailed discussion of box resonances. 124
Chapter 9 Adaptive Band Synthesis (ABS) De-embedding Adaptive data, resulting from an ABS analysis, is either de-embedded or non-deembedded. With other analysis types, when the de-embedding option is enabled (default), then both de-embedded and non-de-embedded response data is calculated and available for display and output. This is not true for an adaptive sweep. In an adaptive sweep, if you run with de-embedding enabled, de-embedded data is available for the whole band. Non-de-embedded data is available only for the discrete data points at which full analyses were performed while synthesizing the response. If you wish to have non-de-embedded data for the whole frequency band, you must perform an adaptive sweep with the de-embed option disabled. Select Analysis ⇒ Setup from the main menu to open the Analysis Setup dialog box, then click on the Advanced button to open the Advanced Options dialog box. Click on the De-embed checkbox to disable de-embedding. For details on these dialog boxes, please refer to Help for the project editor. For more information about de-embedding, see Chapter 7 "De-embedding" on page 97 and Chapter 8 "De-embedding Guidelines" on page 107. Transmission Line Parameters As part of the de-embedding process, em also calculates the transmission line parameters, Z 0 and E eff . You should be aware that when running an ABS analysis these parameters are only calculated for the discrete data points at which a full analysis is run. If you need the transmission line parameters at more data points, analyze the circuit using a non-ABS analysis. Current Density Data Current density data is calculated for your circuit when the Compute Current Density option is enabled in the Analysis Setup dialog box. For non-ABS sweeps, current density data is calculated for all the response data. For an adaptive sweep, the current density data is only calculated for the discrete data points, therefore, your plot in the current density viewer shows a coarse resolution of your frequency band. 125
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