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Graphs

Graphs display data from datasets or equations, which are usually measurement data derived from the analysis of a design. The product has several types of graphs, including:

  • Rectangular Graphs - a Cartesian coordinate plot.
  • 3D Graphs - can display a measurement versus frequency versus a parameter sweep.
  • Antenna Plots - displays Far Field measurements.
  • Polar Charts - displays complex data, such as S-Parameters or impedances.
  • Smith Charts - similar to a Polar Chart, displays impedance and/or admittance.

In addition, data can be displayed in a spreadsheet-style Table view. These differing output options allow you to display data in a variety of formats.

Creating Graphs

Use Instagraph to easily create a graph from a dataset or schematic:

The InstaGraph feature provides a way to easily create new graphs (or data tables) directly from a schematic or dataset. You can use Instagraph, via one of these methods:

  • Right-click on a variable in a dataset, select Graph, and pick a graph type.
  • Right-click on a port or node in the schematic, select Add New Graph / Table, and pick a measurement to plot.

From a dataset

  • Right click a variable in a dataset and select which kind of graph to create

From a schematic

  1. Right-click a port or node on a schematic and select Add New Graph/Table then the measurement you want to graph from the menu.
    The actual items available on the menu are context-sensitive, based on the element or node you clicked and the simulations available. For example, the Relevant S-Parameters option generates measurements for all S-parameter measurements that are pertinent to the indicated port. Also, the workspace must contain at least one analysis referring to this schematic design to make this feature available. (Otherwise there is nothing to plot.)

  2. To create another graph, right click the port again and select a different option. Your screen should now have two new graphs similar to these:
  3. Double-click a graph to change the graph's properties. Right-click a trace or legend to make specific changes to the appearance of the trace or legend. Hover over a symbol (a dot on the trace) to get a pop-up showing the actual data at that point. Check out the Graphs tutorial video for tips and techniques.

To manually create a graph

  1. Click the New Item button *( ) on the Workspace Tree toolbar, select *Graphs, and pick a graph type.
  2. If desired, change the graph name and add a title and/or a brief description of the graph.
  3. Switch to the Graph Properties tab, select a dataset, and use the Measurement Wizard or enter a simple measurement such as S[2,1].
  4. Click OK.

Changing Graph Properties

The Graph Properties window let you change the attributes of a graph, such as the title or the series measurements.

Zooming Graphs

You can zoom rectangular graphs, Smith charts, and polar charts using buttons on the Graph toolbar. Depending on which graph type you are using, some of these buttons might be grayed out. *When you use a zoom option in a graph, only the on-screen view is modified. The actual graph is unchanged.

Normally, only the X-axis on a rectangular graph is zoomed. Hold down the Ctrl key to also zoom the Y-axis.
As you zoom out, the graph background may selectively skip drawing excessive details.This is intentional; it is similar to using a street atlas, a state map, and a world map. Only the appropriate details are shown at a particular zoom setting.

Ways to zoom a graph

  • Click one of the following buttons on the Graph toolbar to use a tool:
    Click this button To select this tool Keyboard
    Pan the graph. P
    Zoom the graph. Z

    After selecting the tool, click and drag in the graph to use the tool. When you let up on the mouse the tool reverts to Select. Zoom in on a rectangular area of the graph by click-dragging with the zoom tool. Click the left button to zoom in; click the right button to zoom out.

  • Click one of the following buttons on the Graph toolbar to automatically zoom to a region
    Click this button To do this
    Zoom the graph to page.
    Maximize the graph to show all the data.
  • Move the mousewheel in/out to zoom the schematic in/out
  • Use the keyboard + and - keys to zoom in and out.

Graph Axis Favorites

As you work with graphs, you will find that you have sections of the graph you want to study consistently. These are called Axis favorites. New for Genesys 2007 you can define Graph Axis Favorites and easily return to them.

  • Click one of the following buttons on the Graph toolbar to save and use Axis Favorites
    Click this button To do Keyboard
    Save the current axis settings as a favorite. F
    Use an axis favorite setting (cycle through the saved settings). B

    When you click the Save Axis Favorite button (or key) the current axis settings will be saved in a short list of favorites. If the list is full the new settings will overwrite the first item in the last (first-in-first-out).

Annotating Graphs

The Annotation button ( ) on the Graph toolbar gives you access to the Annotation toolbar.

The Annotation toolbar provides tools like lines, circles, and text that you can use to point out details of interest on a graph.
The Text Balloon annotation has a "tail" which can be anchored to a data point on a graph, to the page, or not anchored (using the right-button menu).

To create a balloon that initially anchored to a data point, first ensure that no marker is selected. Then right-click a trace vertex (or WhatIF bar) and select "Create Info Balloon". The balloon will be filled in with the floating tip info (the info box that is displayed when the mouse hovers over a data point) and anchored to the point.
Tip for advanced users: To copy the floating tip info to the Windows clipboard (so that it can be pasted), follow the tip above and then double-click the balloon. Select the text and copy it to the clipboard using Ctrl+V.

See Also
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