Introducing the Impedance Matching Utility

The Impedance Matching documentation provides an introduction to the Impedance Matching Utility. The complexity of the Advanced Design System (ADS) is made easily accessible through the automated capability. A first-time or casual ADS user can begin using the capability of ADS quickly, while experienced ADS users can perform tasks faster than ever before. The Step-by-Step Example describes how a singly terminated bandstop elliptical filter can be designed and verified, and a layout generated, in a few minutes.

The Impedance Matching Utility provides SmartComponents and automated-assistants for the design and simulation. All SmartComponents can be modified. You simply select a SmartComponent and, with little effort, redesign or verify their performance. The Using SmartComponents section answers many common questions relating to Utility use and the SmartComponent Reference describes each SmartComponent in detail. The section Automated Design and Analysis introduces Automated Assistants.

Step-by-Step Example

The step-by-step example takes you through the design, analysis and sensitivity simulation of a bandpass lumped element matching network. After completing this example, you should have a basic understanding of the Utility and be ready to begin using the tool. Follow these steps to begin:

Note
You should already be familiar with the basic features of Advanced Design System. For help with ADS basic features, refer to the Schematic Capture and Layout documentation.

Setting Up the Design Environment

Before you can use the Impedance Matching Utility, you must set up the design environment by using these steps:

Note
Before beginning, you must have installed the DesignGuide with appropriate licensing codewords.

Setting DesignGuide Preferences

All DesignGuides can be accessed through either cascading menus or dialog boxes. You can configure your preferred method in the ADS Main window or from the Schematic window.
To configure access through menus or dialog boxes:

  1. From the Main or Schematic window, choose DesignGuide > Preferences .
  2. In the DesignGuide Menu Style group box, choose either Use a selection dialog box or Use cascade menus .
  3. Close and restart the program for your preference changes to take effect.
    Note
    On PC systems, Windows resource issues might limit the use of cascading menus. When multiple windows are open, your system could become destabilized. Therefore, the dialog box menu style might be best for these situations.

The ADS Main window DesignGuide menu contains these choices:

DesignGuide Developer Studio > Start DesignGuide Studio is only available on this menu if you have installed the DesignGuide Developer Studio to open the initial Developer Studio dialog box.

DesignGuide Developer Studio > Developer Studio Documentation is only available on this menu if you have installed the DesignGuide Developer Studio to open the DesignGuide Developer Studio documentation.

Note
Another way to access the DesignGuide Developer Studio documentation is by selecting Help > Topics and Index > DesignGuides > DesignGuide Developer Studio from any ADS program window.

Add DesignGuide opens a directory browser in which you can add a DesignGuide to your installation. This is primarily intended for use with DesignGuides that are custom-built through the Developer Studio.
List/Remove DesignGuide opens a list of your installed DesignGuides. Select any that you would like to uninstall and choose the Remove button.
Preferences opens a dialog box that enables you to:

Opening a Project

The ADS design environment is set up within a project.
To create a new project:

  1. From the ADS Main window, choose File > New Project or click Create a New Project on the toolbar.
  2. In the dialog, define the location of the project and assign a project name.

Opening a Schematic Window

A new schematic design is needed to contain the lowpass component for this example.

To open a Schematic window:

  1. From the ADS Main window, choose Window > __ New Schematic or click New Schematic Window on the toolbar. A new Schematic window appears.
    Note
    Depending on how your ADS preferences are set, a Schematic window can appear automatically when you create or open a project.
  2. In the Schematic window, choose File > New Design to create a design named Example .

Opening the Impedance Matching Utility

The Impedance Matching Utility is accessed from the Tools menu or the DesignGuide menu in the Schematic window.

To open the Impedance Matching Utility:

  1. In the Schematic window, choose Tools > Impedance Matching . The Control window opens. Or, you can select one of these:
    • DesignGuide > Amplifier > Tools > Matching Utility
    • DesignGuide > Filter > Impedance Matching
    • DesignGuide > Mixers > Tools > Matching Utility
    • DesignGuide > Oscillator > Tools > Impedance Matching
      Note: Expand the list under Tools by clicking the + sign.

Using the Control Window

All Utility features are available from the Control window. The Control window houses menus, a toolbar, and SmartComponent manipulation controls. The menus and toolbar buttons perform the basic functions of design, delete, and display the SmartComponent palette. Full features are available from each of the tab pages on the window. The window can be placed anywhere on the screen. Explore each tab page by clicking on the tab at the top of each page. Explore the window menus as well to familiarize yourself with the basic Utility capabilities.

The pull down lists at the top of the Control window are designed to help you navigate multiple schematic windows and SmartComponents. You can use the Current Schematic drop-down list box to select any of the currently opened schematic windows. This field is updated any time Impedance Matching Control Window is selected from the Tools menu. From the SmartComponent drop-down list box, you can select any of the SmartComponents on the currently selected schematic window.

To close the Control window:

Designing and Analyzing a Network

In this step-by-step example, you design and analyze a bandpass matching network. A bandpass matching network can be designed easily by using the default component parameter settings. Using the Utility follows a normal design flow procedure:

Note
Before starting this section of the step-by-step example, confirm your setup (Setting Up the Design Environment).

Displaying the SmartComponent Palette

The program contains a SmartComponent palette, Impedance Matching Networks , that provides quick and easy access to the SmartComponents. A blue accent in the upper-left corner of a palette button indicates the component is a SmartComponent.

You can display the SmartComponent palettes in one of these ways:

Placing Example Component in the Design

To place the SmartComponent in the design:

  1. Click LCBandpassMatch on the component palette to select the component.
  2. Click within the schematic window to place the component.
    • You can change the orientation of the SmartComponent before placement by selecting from the Insert > Component > Component Orientation commands or by selecting Rotate by -90 repeatedly from the schematic toolbar.
    • The place component mode remains active until you choose End Command from the schematic toolbar.
      Note
      When a SmartComponent is placed initially, a temporary component is used to place and specify the parameters for the SmartComponent. This component does not contain a subnetwork design. After the utility has been used to design the SmartComponent, the temporary component is replaced with a permanent component. The SmartComponent is renamed to DA_ComponentName_DesignName and an autogenerated design is placed inside the SmartComponent's subnetwork design file. Subsequently, if the SmartComponent parameters are edited, the utility must be used again to update the subnetwork design file.

Changing SmartComponent Parameters

Parameters can be changed directly from the Control window.

To edit the LCBandpassMatch component parameters:

  1. In the Control window, select the LCBandpassMatch component from the SmartComponent drop-down list. This ensures all changes are referenced to this component.
  2. Select the Matching Assistant tab. Leave all parameters at default.
    Note
    See Placing and Editing SmartComponents for details on changing parameters in the design window or component dialog box.

Designing the Matching Component

You can design and analyze the SmartComponent from the Control Window.

To start the simulation:

  1. On the Matching Assistant tab, click Design to start a simulation and generate the design for the SmartComponent. When the simulation has finished, a Impedance Matching Utility dialog box appears.
  2. Click Select to complete the process.

To analyze (simulate) the network:

  1. Select the Simulation Assistant tab on the Impedance Matching Utility window.
  2. Click Automatically Set Frequencies followed by Simulate to start the Simulation Assistant and analyze the SmartComponent. Part of the analysis results are shown below.

Closing the Matching Component Results Window

Examining the Matching Component Design

You can look at the details of the autogenerated design inside the SmartComponent's subnetwork.
To examine the component's subnetwork:

  1. Select the component LCBandpassMatch .
  2. Click Push Into Hierarchy on the schematic toolbar.
  3. After examining the design, click Pop Out on the schematic toolbar to close the view.

Analyzing Yield of the Matching Network

After the design process, the component sensitivities of the matching network can be checked using the Yield Assistant .
To find components to analyze:

  1. Click the Yield Assistant tab on the Impedance Matching Utility window.
  2. Click View Components > Modify Statistics/Optimization . The matching network displays in the schematic along with a dialog box.

To choose components:

  1. Choose Enabled from the Statistics Status drop-down menu.
  2. Select Next to move on to the next component. Repeat this until all 3 components in the network are enabled, and then click Done .
  3. Click Close in the Statistical Component Values dialog box.

To analyze yield sensitivity of the network:

  1. In the Yield Assistant tab, select Automatically Set Frequencies .
  2. Select by Simulate to start the Yield Assistant and analyze the yield sensitivity to the selected component values. The results display automatically. The sensitivity histogram for component C1 is shown here.
  3. To close the display window, choose File __ > Close Window from the menu.

Deleting the Matching SmartComponent

 

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