Gating provides the ability to mathematically remove the effect of a particular circuit element. You define the start and stop points of the gate. The gated section is replaced with an ideal transmission line having the same electrical delay.

Gating is applied to time plots of individual parameters. While gating the time domain plot of a parameter, you can observe the effect that gating has on the frequency domain of the same parameter.

In this topic:

Other Features to Remove Unwanted Responses

How to Perform Time Domain Gating

  1. Click Utilities, then Gating.

  2. Click either Gating (Single-Ended) or Gating (Balanced) depending on which parameter you want to gate.  This selection allows you to choose from the appropriate parameters. For example, when you choose Single-Ended, the Single-Ended parameters are displayed and available for you to select from the Parameter Bar and Data menu.

  3. From the Parameter Bar or from the Data menu, select the parameter to which the gate setting will be applied. When you select the parameter, a new Gating Window opens with two plots displayed side-by-side as shown below:

This allows you to see how adding the gate in Time Domain affects the parameter in the Frequency Domain.

Important Gating Window Notes

  • You can view gating on only ONE parameter at a time. To view a different parameter, click a parameter from the Parameter Bar or from the Data menu.

  • You can right-click either plot window to Autoscale or Reset Scale the traces in that plot.

  • The gating window that contains the Time and Frequency plots cannot be saved.

  • Gate numbering: Up to 10 gates can be added. The gates are numbered sequentially from the left edge of the plot to the right edge. For example, the first gate (Gate 1) was added. Then a second gate is added to the left of the Gate 1. The gates are then renumbered such that the gate on the left (the second gate that was added) becomes Gate 1, and the original gate is changed to Gate 2. Either deleting or moving a gate can cause the gates to be renumbered.

  • The gated frequency data can be exported to a text file. See Exporting Data.

  1. The Gating dialog appears. Right-click the dialog to allow it to float or dock. Learn more.

  2. On the Gating dialog, click Start.  A vertical marker (M1) line appears on the time domain plot. Using the slide control on the Gating dialog, move the line to to set the start position of the gate. The selected Start time displayed in the Start box.

  3. Click Stop. A vertical marker (M2) line appears on the time domain plot.  Using the slide control, move the line to set the stop position of the gate.

  4. Gating Mode - Defines the type of filtering that will be performed for the gating function.

  1. Gating applies to:  (Available ONLY when a reflection parameter is selected for gating.)

  1. Click the Add button to add the gate. A gate identifier is added to the Gate box.

  2. Click Apply to overwrite the displayed gate number.

  1. Repeat Steps 5 through 11 to add additional gates. A maximum of 10 gates can be added.

  2. The gated frequency data can be exported to a text file. See Exporting Data.

To Move a Gate

  1. Select the gate.

  2. Click Move

  3. Adjust the slide control left or right to the desired location.

  4. Select Apply to gate the response.

Both the start and stop values of the gate are moved. The range between the start and stop values of the gate remains the same.

To Delete a Gate

To return to viewing non-gated parameters

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