Sonnet User's Guide - Sonnet Software

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Sonnet User’s Guide You can edit the name and attributes of this network including the number of ports by double-clicking on the entry. This is true of all entries made in the netlist; you must double-click on them to open the dialog box which allows you to edit the entry or select the item, then select the Tools ⇒ Modify command from the main menu. Netlist Example Files All of the example files used in this chapter are available in the Att example in the Sonnet examples. You should copy the entire folder into your working directory if you wish to execute the examples. For directions on obtaining a Sonnet example, select Help ⇒ Examples from the menu of any Sonnet program, then click on the Instructions button. Cascading S-, Y- and Z-Parameter Data Files A particularly useful feature provided by a netlist project is the ability to cascade multiple S-, Y- and Z-parameter data files. There are no restrictions on the file formats which may be cascaded. For example, you can cascade em Z-parameter data in Touchstone format with measured S-parameter data in Super-Compact format. In addition, em can analyze at frequencies which are not included in the data files. Em automatically interpolates if there are any differences between the requested frequency points and those in the data files. A good example of a cascading operation is the project att_cascade.son, which is included in the Att example for this chapter. A schematic representation of the two-port circuit is shown below. This circuit consists of two identical thin film resistors connected in series. The S-parameters from the geometry project analysis on the thin-film resistor are used as a data file element in the netlist. The desired output network is the series combination of resistors. The S-Parameter data file, att_res16.s2p, as well as the geometry project, att_res16.son, used to generate the data file, are included in the examples for this chapter. 200
Chapter 13 Netlist Project Analysis Node 1 S-parameter Node 2 S-parameter Node 3 1 2 file“att_res16.s2p” file“att_res16.s2p” The two-port S-parameters contained in file “att_res16.s2p” are cascaded to obtain an overall set of two-port S-parameters. The netlist, att_cascade.son, for the circuit is pictured below. The main network, Resnet, has two ports indicated by the “2” in DEF2P. Port 1 corresponds to node 1 in the network. Port 2 corresponds to node 3. There are two data file elements in the network. The first entry is the response file att_res16.s2p with 2 ports. Port 1 corresponds to node 1 of the network, which, as mentioned above, is port 1 of the whole circuit. Port 2 for the data file corresponds to node 2 of the network. The other entry is also for the data file att_res16.s2p except that port 1 of the data file goes to node 2 of the network which means that port 1 of the second data file is connected to port 2 of the first data file. Port 2 of the second data file corresponds to node 3 of the network. Node 3 of the network is Port 2 of the network “RESNET”. 201
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