Sonnet User's Guide - Sonnet Software

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<strong>Sonnet</strong> User’s <strong>Guide</strong> The S-Parameters for an analysis of the netlist are shown below. Frequency: 200 MHz 50-Ohm S-Params. Mag/Ang. Touchstone Format. (S11 S21 S12 S22). 200.000000 0.250782 -5.309 0.748778 -6.263 0.748778 -6.263 0.250782 -5.309 Frequency: 300 MHz 50-Ohm S-Params. Mag/Ang. Touchstone Format. (S11 S21 S12 S22). 300.000000 0.250310 -7.963 0.748702 -9.395 0.748702 -9.395 0.250310 -7.963 Frequency: 400 MHz 50-Ohm S-Params. Mag/Ang. Touchstone Format. (S11 S21 S12 S22). 400.000000 0.249650 -10.62 0.748595 -12.53 0.748595 -12.53 0.249650 -10.62 A Network File with Geometry Project The next example demonstrates a netlist project analysis which invokes a geometry project analysis in conjunction with using previously generated data. To demonstrate a netlist with a geometry project, the two-port T-attenuator shown below will be analyzed. Node 1 S-parameter Node 2 S-parameter Node 3 file “att_res16.s2p” file “att_res16.s2p” 1 2 geometry project “att_res67.son” The two-port T-attenuator will be analyzed with em to demonstrate a combined electromagnetic/circuit analysis. 202
Chapter 13 Netlist Project Analysis Pictured below is the geometry project “att_res67.son”, which is a 67 ohm thinfilm resistor. This project is read by em and analyzed during the netlist analysis. The results of the project analysis are used to compute the results for the netlist. Transmission Line 67 ohm Thin-Film Resistor Transmission Line The netlist project, att_combine.son is shown below. The project att_combine.son is available as part of the Att example for this chapter. The primary distinction between the netlist shown above and the previous netlist is that this netlist contains an instruction to perform a project analysis. The PRJ keyword instructs em to run an electromagnetic analysis on the project “att_res67.son” using the analysis controls from the netlist. The analysis control use is indicated by “Hierarchy Sweep” in the PRJ statement. When control is set to “Hierarchy Sweep”, em automatically analyzes the subproject at the same frequency sweep and run options as the netlist. During the analysis, em performs the following steps: 1 Reads S-parameter data from the file “att_res16.s2p”. 2 Performs an electromagnetic analysis of the geometry project “att_res67.son”, a 67 ohm thin-film resistor. 203
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