06_ADS2012_Momentum电磁仿真实验教程

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

Lab 2: EM Basics

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

Copyright 2011 Agilent Technologies

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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

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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

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Lab 2: EM Basics

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.

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

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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

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Lab 2: EM Basics

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.

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

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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

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Lab 2: EM Basics

7.

Add a Substrate Layer

a. Use the cursor and right-click in the

Alumina substrate area as shown here.

Then click Insert Substrate Layer

Above as shown. Immediately, another

Alumina substrate is added and you have

two Alumina layers.

b. On the right panel, use the drop-down arrow button to select the Dielectric_1

material (you defined this in the library’s technology earlier). Set the

Thickness to 30 mils – press Enter and you will see it.

8.

Map a Via and Intruded Conductor

a. Again, use the cursor and right-click on

Dielectric_1 as shown here. When the

menu appears, select Map Conductor Via.

Immediately, you will see the hole layer

appear automatically. On the right, set the

Conductor Via Material to

PERFECT_CONDUCTOR as shown here.

The via is now mapped as the hole drawing

layer through Dielectric _1.

This means that the hole drawing layer is now considered a via – you will see

this in the 3D preview.

Copyright 2011 Agilent Technologies

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Lab 2: EM Basics

b. Move your cursor to the interface above

Dielectric-1 as shown here, and right-click.

c. Select the command Map Conductor Layer and another strip conductor will

appear: cond2. With cond2 selected, go to the panel on the right and set the

Material to Conductor_1. Also, and click to set the Operation to Intrude

into substrate and set the Position to Above interface.

d. Also, set the metal Thickness to 0.5 mil as shown.

At this point, you have defined the two layer Alumina substrate with a via and 2

metal conductors, including thick metal for Cond2. Now it is ready for a

layout to be viewed or solved.

e. If you have any problems, unmap / delete as needed. Or,

close the editor and begin again. But if you have the

correct setup, then Save it using the icon shown here.

NOTE: Substrates you define and save can be used for

other cells or workspaces.

Copyright 2011 Agilent Technologies

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Lab 2: EM Basics

Now it’s time to set the ports but first you should see the commands for

importing substrate files into ADS from other ADS versions.

9.

Importing Substrates

a. In the Substrate Editor window, select

the comamnd File > Import shown

here, and look at each dialog that

appears for each command.

Do not select anything at this time.

This is only to show that you can easily

use any other available substrates and

you can also modify them and save

them in your workspace library or

other library.

b. Cancel the dialogs when finished – it’s

time for the Ports. Then close the

Substrate Editor.

10.

EM Setup: Yellow Caution Signs

a. In layout, click on the EM Setup icon. You should see that only the

Ports have the yellow caution sign. Also, the Main window should

show the Substrate and the EM setup. Right-click and use Filter View

if you don’t see the substrate.

b. If your Main window and EM setup window look like this, then you are ready to

continue. If not, go back and check your work.

Copyright 2011 Agilent Technologies

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Lab 2: EM Basics

11.

Selecting Pins and Defining Ports

a. In the layout window, select the Insert Pin

icon and insert two pins (P1 and P2) as shown

here – you do NOT need to change layers.

b. Go to the EM Setup window and click the Ports icon.

c. Notice that the S-parameters ports area is empty as shown here. This means

no ports have been specified. Click the green Refresh Pins and Ports

button – it will automatically recognize layout pins and they will appear as

shown here – these layout pins will become EM ports next.

d. Now that the pins are recognized, click

the Auto-create new ports button.

Immediately, two ports are created

based on the pins in layout. Also, these

ports are automatically set to TML

calibration (Transmission Line

Calibration) – this is the default type,

with 50 Ohms as the reference

impedance.

NOTE: You can also select pins

individually in the Layout Pins field and

use the Create Port

button to create

them separately.

Copyright 2011 Agilent Technologies

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Lab 2: EM Basics

e. Use your cursor to click in

the fields shown here. This

is how you can change port

settings for your designs.

But do not make any

changes for this lab.

f. Click the Save icon to save this EM setup.

12.

Using the 3D EM Preview

a. With the substrate and the ports now

complete, you can preview the layout in

the 3D viewer . Also, there are no more

yellow caution signs.

b. Click the 3D EM Preview icon shown

here – this the same 3D viewer that can

be launched from layout.

c. Take a few minutes to look at the object – try rotating it with your cursor, click

on layer names, or try changing various Options. After the simulation, you will

use Visulization in this same viewer to see the currents. Close the viewer

when you have finished.

Copyright 2011 Agilent Technologies

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Lab 2: EM Basics

13.

Defining Frequency Plan, Output Plan, and Mesh Options

a. In the EM Setup window, click the Frequency plan icon and set the Fstop to 2

GHz using your cursor in the field. This is how you set values in these fields.

b. Then click the Output plan icon and look at the Dataset name and Template

that will be used. You can change these for your designs but these defaults will

be used for this lab.

c. Now, before running the simulation, you can look at the Options in the EM

setup window where the Mesh controls are located. Most of the time, you will

not have to adjust the settings, but some designs may require it – so you should

know where they are located.

d. Click the Options icon and go to the Mesh tab as shown here – but

do NOT make any changes for this lab. Also, do NOT simulate yet.

e. Notice the options you

have - you can control the

mesh here, you can save

the setup with a name,

you can run the

simulation and more. You

can also choose to

preprocess the geometry

or substrate. This is an

advantage if you make

any changes and want to

see the intermediate

results before simulation.

Again, do make and

changes and do NOT

simulate yet.

Copyright 2011 Agilent Technologies

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Lab 2: EM Basics

14.

EM Model and Simulation

a. In the EM Setup window, click the Model/Symbol icon.

b. In the EM Model section, check the box to Create EM Model when

simulation is launched.

Leave the Symbol area

alone – you will use that

in the next lab exercise.

c. Now, click the Simulate

button at the bottom of

the Model/Symbol setup.

The simulation will start

and you can watch the

Job status window – look

at the information the

Momentum simulator

reports and click OK if

prompted.

d. When finished, look at the Main window and you will see the emModel created

in the cell – click on the icon and examine it as shown here. Then close the

emModel dialog – also close the Job window.

Copyright 2011 Agilent Technologies

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Lab 2: EM Basics

15.

EM Simulation Data

a. When the simulation is finished, the

Data Display with the default

template results will appear. Notice

that the Data Display has three pages

– look them over and also notice that

the default dataset is the adaptive

data: the cell name ends with: _a.

This is correct and this is the one you

want to use.

b. Look closely at the at the traces and you will see red points and a blue trace.

The red points are the explicit simulation data points and the blue trace is the

adaptive trace data determined from those points. Try changing the datasets

and you will see it clearly. Also, move the slider to the port 2 orientation and

the plotted data will change to S(2,1).

c. Save and close the Data Display when finished.

d. Look at the ADS 2011 Main window. It should show all the items you created,

including the EM Model, the EM Setup, the layout, the substrate and the data

display. Save the layout window.

You should now have a good basic

understanding of: how to set up an EM

substrate, assign the ports to the pins in your

layout, run a Simulation, examine the mesh

and data, and plot the currents.

Copyright 2011 Agilent Technologies

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Lab 2: EM Basics

16.

Optional: Visualization of Current

Do this only if you have time – you will visualize current in the next lab

exercise so this step is only is you have finished the other steps quickly.

a. Click the Visualization icon in layout as shown here.

b. When the window opens, go to the bottom left and click Solution Setup and,

under Frequency,select 2 GHz. Then go to the Plot Properties (Arrow tab)

and Enable the arrows and click the Animate box. You should see the

animated surface currents – rotate the object as desired.

c. When finished, close the Visualization window, then Save and Close all the

windows and dialogs: Visualization, Layout, EM Setup, etc. Use the Main

window command, File > Close All, to do this easily.

END OF LAB EXERCISE

Copyright 2011 Agilent Technologies

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