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ADSMomentum电磁仿真实验教程资料.pdf

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    ADS 2011 EM Basics (v2 October 2011) LAB EXERCISE 2 EM Basics (Momentum) Topics: EM simulation in ADS, focusing on Momentum, including substrate and port setups, 3D viewing, visualization, and more. Audience: Engineers who have a basic working knowledge of ADS 2011, have completed the prerequisite course, or who require EM training. Prerequisites: Completion of the course, Workspaces and Simulation Tools or equivalent experience, including ADS layout skills. Objectives: Be able to set up and run EM simulations from ADS layout, including creating a substrate and defining Technology layers and materials. © Copyright Agilent Technologies 2011
    Table of Contents: Lab 2 1. Create a New Workspace and Layout 2. Define Dielectric Materials: Technology File 3. Draw a layout: 2 metal strips and a via 4. Open the EM Simulation Setup 5. Add a new Substrate 6. Define strip conductors (metal) 7. Add a Substrate Layer 8. Map a Via and Intruded Conductor 9. Importing Substrates 10. EM Setup: Yellow Caution Signs 11. Selecting Pins and Defining Ports 12. Using the 3D EM Preview 13. Defining Frequency Plan, Output Plan, and Mesh Options 14. EM Model and Simulation 15. EM Simulation Data 16. Optional: Visualization of Current Lab 2: EM Basics 3 4 5 6 6 8 9 9 11 11 12 13 14 15 16 17 Copyright 2011 Agilent Technologies 2
    Lab 2: EM Basics 1. Create a New Workspace and Layout a. In the ADS Main window, use the wizard to create a new workspace: File > New > Workspace or use the icon. Name the workspace and library: My_EM_wrk - add only the Analog/RF library as shown here and finish. b. Create a new layout using the default cell name: cell1, as shown here. c. In the Layout window, select Options > Technology > Material Definitions. When the dialog appears, select the Dielectrics tab – notice it is empty. Of course, if you are using a PDK or library with substrates already setup, then you might be able to see some materials listed here. This lab will show you how to create materials for use with a substrate. Copyright 2011 Agilent Technologies 3
    Lab 2: EM Basics 2. Define Dielectric Materials: Technology File a. Click the Add Dielectric button and a default name (Dielectric_1) will be added. Next, change the Real value = 6 (Permittivity) as shown here and click Apply. You could set other values but this is enough. b. Click the Add From Database button and click on Alumina from the list of pre-defined dielectrics. Click OK and your two dielectrics should appear. Notice that you can change the type, but leave it as Svensson/Djordjvic. Copyright 2011 Agilent Technologies 4
    c. Next, select the Conductors tab and click Add Conductor. The default will be added (Conductor_1). Then click Add From Database and select Gold, then click OK to add it and click Apply. With the materials added, click OK. Lab 2: EM Basics 3. Draw a layout: 2 metal strips and a via a. In the layout window, draw this simple design using three layers and the values in mils shown here. Change the entry layer as needed to draw two rectangles (use Cond and Cond2) and a centered circle (use Hole). Note that the colors shown may be different than your colors – it is not important. Copyright 2011 Agilent Technologies 5
    Lab 2: EM Basics b. Save the layout when you have finished – you will add pins/ports later. 4. Open the EM Simulation Setup a. Select the EM Simulation Setup icon in layout to open the EM Setup dialog (shown here). b. Notice the yellow caution signs next to the Substrate and Ports icons. This means that these two items have not been specified and you cannot run the simulation yet. Read through the Setup Overview quickly then close the EM setup. Next, you will open the Substrate editor and define a substrate for your layout. 5. Add a new Substrate a. NOTE on substrates: You can use or copy substrates from any library in your workspace. But for this workshop you will create a new substrate so that you are more familiar with how the editor works. b. In the Layout window, click the Substrate Editor icon and click OK. Then click OK again to use the default name (Substrate1) for your substrate. c. Notice that a Template for 25 mil Alumina will be used – this is a starting point. Copyright 2011 Agilent Technologies 6
    d. This is the substrate editor with a 3-D like view of the layers for this template, including a conductor (cond) and the boundary conditions. This is always a starting point for new substrates. Read the information on the right about how to add, delete, or select items but do not do anything yet. Lab 2: EM Basics The steps that follow will guide you through the creation of the stack-up and mappings shown here, using library Technology materials – this picture shows what the substrate will look like after you follow the steps. NOTE: You can define materials (dielectrics, conductors, etc.) in the Substrate Editor because it gives you access to the Technology file as you will see. However, defining them first, in the Technology file is recommended. Copyright 2011 Agilent Technologies 7
    Lab 2: EM Basics 6. Define strip conductors (metal) Now you will define the cond drawing layer to be a strip conductor: Gold. a. Click on the cond strip in the graphical substrate editor on the left - it will become outlined and the properties will appear on the right. You always have to click on the 3D substrate drawing to see the properties. Next, set layer cond Material = Gold by using the drop-down arrow button for Material to change cond from perfect conductor to Gold. NOTE: the box for Only pins and pin shapes from layer is only checked if you are mapping pins (vias) but no other metals or conductors. b. Next, click the Edit Materials button with three dots […] next to the drop down arrow for Material. This shows the Technology file material. Notice you could add surface roughness for conductors used in Momentum simulations – but do not. This is only to show how the EM substrate editor works. If you use a library PDK, then all the materials from that PDK would appear. c. Cancel the Material Definitions dialog. Copyright 2011 Agilent Technologies 8
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