View Results in Sonnet

You may examine the results of your simulation in Sonnet’s response viewer. In this section of the tutorial, we will plot the differential inductance and differential Q by using equations. You will also learn how to add a marker to your plot. Note that there are also equations available to plot the single-ended inductance and Q factor of your circuit if you wished to see those values. The equations we will use allow you to look at the results differentially.

68.  Click on the View Response button at the bottom of the Sonnet Cadence Virtuoso Interface main window. 

Sonnet’s session window appears on your display with a graph tab that contains a plot of  DB[S11]. This is the factory default curve displayed the first time a graph is opened for a project. You may also select  Results - View Response from the main menu of the Sonnet Cadence Virtuoso Interface window to invoke the response viewer.

69.  Select Graph ⇒ Manage Curves from the response viewer main menu.

The Manage Curves dialog box appears on your display.

70.  Click on the DB[S11] curve in the Curves panel in the Manage Curves dialog box.

The curve entry is highlighted. Selecting the curve allows you to edit the curve. Note that the present settings of the curve are displayed in the Measurement panel and the Properties panel.

71.  Using the scroll bar, scroll down the Measurement list to the Transformers and Inductors section, then click on the CT_LDiff measurement to select it. 

The Properties panel is updated with the inputs for the differential inductance of a center-tapped inductor. The default properties do not need to be changed for the tutorial.

72.  Click on the Apply button in the Manage Curves dialog box to apply the changes to your plot.

The plot is updated with the differential inductance. The curve entry is updated in the Manage Curves dialog box to display CT_LDiff.

73.  Click on the  button in the Manage Curves dialog box.

The default curve, DBS[11] is added to the curve list and is selected.

74.  Using the scroll bar, scroll down the Measurement list to the Transformers and Inductors section, then click on the CT_QDiff measurement to select it. 

The Properties panel is updated with the inputs for the differential Q factor of the inductor.

75.  Click on the Axis entry in the Properties panel.

The entry is updated and now displays a drop list.

76.  Select "Right Axis" from the Axis drop list in the Properties.

The Q Factor curve will be plotted on the right axis.

77.  Click on the Apply button of the Manage Curves dialog box.

The dialog box is updated and the curve is now listed under the Right Axis. The plot is also updated.

78. Click on the Close button in the Manage Curves dialog box.

The dialog box is closed.

79.  Select Graph ⇒ Options from the main menu in the Graph tab.

The Graph Options dialog box is opened on your display.

80.  If it is not already selected, click on "General" in the sidebar menu of the Graph Options dialog box.

The appearance of the dialog box is updated to display the General page.

81.  Enter “Tutorial Inductance” in the Title text entry box.

The automatically generated label in this case is quite long, so using the shorter label makes the plot easier to understand. The dialog box should now appear similar to that shown below.

82.  Click on the OK button to update the title and close the dialog box.

The plot now displays the new title and the two curves as shown below. The Differential Q Factor is on the left axis and the Q factor is on the right axis as shown below.

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