Sometime, the program tries to fit the graph to the size of the graph window. Run a network analysis of your RF circuit with the following parameters:Īt the end of the simulation, view the resulting Smith chart.
In order to better view the data points on the Smith chart, change the step size to 500MHz in the Sweep tab of the test panel. For the "Graph Type", check the "Smith" checkbox. For this purpose, open the Network Analysis Test Panel of the Toolbox once again, and this time choose the S radio button in the "Parameter Set" section of the Output tab. RF.Spice A/D allows you to plot the S-parameters of your circuit on the Smith Chart. The Smith chart is a very useful graphical tool for RF engineers. Check the checkboxes labeled Decibels and Degrees for magnitude and phase, respectively.Ĭartesian graph of the real and imaginary parts of the Z11-parameter. From the top "Graph Type" options, choose Cartesian (Mag/Phase).
Since your circuit is a one-port, you will have the S11-parameter only. In the third tab of the dialog, Output, go to the "Parameter Set" section and choose the S radio button to compute the scattering parameters. This will provide a smooth graph of the port characteristics. Select a linear scale interval and set the step size to 10MHz. In the second tab, Sweep, set the start and stop frequencies to 1GHz and 5GHz, respectively. Accept the default value of 50Ω for the "Reference Impedance". In this case, Port 1 is defined between Node 2 and the ground. In the first tab, Connections, you define the port(s) of your circuit. It has three tabs at the top: Connections, Sweep and Output. In the Toolbox, select the Test Panel and check the "Network Analysis" checkbox. In this case, you will define a one-port network with an input port established at the input of the T-Line between Node 2 and ground. Network analysis calculates the S/Z/Y parameters of your circuit based on the port(s) you define for your RF circuit.
Running a Network Analysis of Your RF CircuitĪs a first step, you will run a "Network Analysis" test of your RF circuit. The quarter-wave impedance transformer circuit tuned for f 0 = 2GHz.
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