ADS Momentum Tutorial HL KY Final W09
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Transcript of ADS Momentum Tutorial HL KY Final W09
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EEC 132
ADS Momentum Tutorial
Huan Liao
Kelvin Yuk
Winter 2009
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This is a brief tutorial on the use of ADS Momentum. Please refer to the ADS/Agilent site
http://eesof.tm.agilent.com/products/momentum_main.html for additional information.
Example:
Design a microstrip radial stub low pass filter, with 1 dB corner frequency at 3.2 GHz, and at least
25 dB of attenuation in the range :3.9-6.0 GHz. The lumped circuit design is shown in Figure 1.
Simulate this design and plot its S-parameters.
1.
Lumped Circuit Design
S_Param
SP1
Step=0.01 GHz
Stop=10.0 GHz
Start=0.5 GHz
S-PARAMETERS
CC4
C=1.728 pF
L
L3
R=L=3.129 nH
CC3
C=2.624 pF
L
L2
R=L=3.343 nH
CC2
C=2.624 pF
L
L1
R=L=3.129 nH
CC1
C=1.728 pF
TermTerm2
Z=50 Ohm
Num=2
TermTerm1
Z=50 Ohm
Num=1
Figure 1. Schematic of Lumped Circuit
2.
Distributed Circuit Design, using radial stubs. The lumped design has been converted into
microstrip transmission line elements as shown in Figure 2. Transmission lines have been
used in place of the inductors and radial stubs have been used in place of the capacitors.
Fifty-ohm microstrip transmission lines and tapers have been added to each end of the filter.
Simulate this design and compare it with the lumped design.
MSUBMSub1
Rough=0 mil
TanD=0T=0.7 milHu=3.9e+034 milCond=1.0E+50Mur=1Er=4.3H=59 mil
MSub
S_ParamSP1
Step=0.01 GHzStop=10.0 GHzStart=0.5 GHz
S-PARAMETERS
TermTerm2
Z=50 Ohm
Num=2
TermTerm1
Z=50 Ohm
Num=1
MLIN
TL1
L=300 milW=115 milSubst="MSub1"
MTAPER
Taper1
L=97.5 milW2=40 milW1=115 milSubst="MSub1"
MLIN
TL5
L=300 milW=115 milSubst="MSub1"
MTAPER
Taper2
L=97.5 milW2=40 milW1=115 milSubst="MSub1"MBSTUB
Stub4
D=15 mil Angle=60Ro=218.7 milW=40 mil
Subst="MSub1"
MLIN
TL4
L=215 milW=40 milSubst="MSub1"MBSTUB
Stub3
D=15 mil Angle=45Ro=276.6 milW=40.0 mil
Subst="MSub1"
MLIN
TL3
L=225.7 milW=40 milSubst="MSub1"MBSTUB
Stub2
D=15 mil Angle=45Ro=276.6 milW=40.0 mil
Subst="MSub1"
MLIN
TL2
L=215 milW=40 milSubst="MSub1"MBSTUB
Stub1
D=15 mil Angle=60Ro=218.7 milW=40 mil
Subst="MSub1"
Figure 2. Schematic of Distributed Circuit
3.
Momentum1)
Generate the schematic for Momentum simulation
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In order to set up the Momentum simulation, a schematic using microstrip components
must be converted into a layout and the appropriate ports need to be designed. Using the
schematic shown in Figure 2 above, delete the 50-ohm Term components and the
S-Parameter block..
Add two ports to the schematic as shown in Figure 3.
Port
P2Num=2
Port
P1Num=1
MSUB
MSub1
Rough=0 milTanD=0T=0.7 mil
Hu=3.9e+034 mil
Cond=1.0E+50Mur=1Er=4.3
H=59 mil
MSub
MLIN
TL1
L=300 milW=115 mil
Subst="MSub1"
MTAPER
Taper1
L=97.5 mil
W2=40 milW1=115 mil
Subst="MSub1"
MLIN
TL5
L=300 milW=115 mil
Subst="MSub1"
MTAPER
Taper2
L=97.5 mil
W2=40 milW1=115 mil
Subst="MSub1"MBSTUB
Stub4
D=15 mil Angle=60
Ro=218.7 milW=40 mil
Subst="MSub1"
MLIN
TL4
L=215 milW=40 mil
Subst="MSub1"MBSTUB
Stub3
D=15 mil Angle=45
Ro=276.6 milW=40.0 mil
Subst="MSub1"
MLIN
TL3
L=225.7 milW=40 mil
Subst="MSub1"MBSTUB
Stub2
D=15 mil Angle=45
Ro=276.6 milW=40.0 mil
Subst="MSub1"
MLIN
TL2
L=215 milW=40 mil
Subst="MSub1"MBSTUB
Stub1
D=15 mil Angle=60
Ro=218.7 milW=40 mil
Subst="MSub1"
Figure.3. Schematic of Circuit for Momentum Simulation
2) Generate/Update Layout
The schematic is ready for conversion into a layout. Go to the Layout menu, select
Generate/Update Layout. Click OK in the dialog box. The layout shown in Figure 4. will
appear.
Figure 4. Layout of microstrip distributed filter
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3)
Define and Solve the Substrate
You must instruct Momentum as to how the different metal/slot layers in your drawing are
“mapped” to different layers of your substrate.
This is achieved by either (1) updating the substrate parameters defined in the MSUB
component (recommended) or (2) by defining the substrate parameters within the Momentum
controller.
(1) The first is accomplished by selecting Momentum->Substrate->Update from the menu
bar in the Layout window as shown in Figure 5.
Figure 5. Updating the Momentum substrate information using information from the
MSUB component in your schematic.
(2) The other requires you to set information about the substrate in an additional dialog box
which can be activated by Momentum->Substrate->Create/Modify as shown in Figure 6.
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Figure 6. Manual creation of Momentum substrate parameters
In the Substrate Layers Tab shown in Figure 7, enter the Thickness and the Permittivity which are
the same as those in the schematic.
Figure 7. Create/Modify Substrate: Substrate Layers
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Click the Layout Layers tab as shown in Figure 8. Highlight and enter the Thickness and
Conductivity of the metal layer which agree with those in the schematic.
Figure 8. Create/Modify Substrate: Layout Layers
In most cases, you can first perform an “Update from schematic” substrate definition,
followed by a check using “Create/modify” option. In this case, the Substrate Layers have been
loaded already; you just need to edit the Metallization Layers.
Click on the Momentum pull-down menu and select Substrate -> Precompute Substrate as
shown in Figure 9.
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Figure 9. Precompute Substrate
In this step, Momentum will perform a series of computations that are specific to the
substrate definition only, not the shapes of the objects in the layout. This is useful since you may
be able to use the same substrate for different shapes of microstrip circuits, but you will not have
to re-compute these preliminary functions. A pop-up window appear asking for the minimum
frequency and maximum frequency of substrate computations. Enter a minimum frequency of
0.5 GHz and a maximum frequency of 10 GHz as shown in Figure 10. A status window
displaying details of the computation will appear as shown in Figure 11.
Figure 10. Specifying the frequency range of the substrate computation.
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Figure 11. Status window displaying details of the substrate computation
When the substrate calculations are complete, save the substrate computation by clicking on
Momentum -> Substrate -> Save as shown in Figure 12.
Figure 12. Saving the substrate computation results.
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4)
Mesh Setup
Before the simulation can proceed, we need to define the mesh by opening the mesh
setup dialog box. Click Momemtum->Mesh->Setup… as shown in Figure 13.
Figure 13. Setup the Mesh
A Mesh Setup Controls window will appear as shown in Figure 14. The important
parameter is the mesh frequency which is the highest frequency you want to analyze the
circuit for. In our case, 10 GHz will be good. (the higher the frequency, the finer the mesh will
be and the longer the simulation time.) Enter 10GHz as the Mesh Frequency and click OK
as shown in Figure 14.
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Figure. 14. Mesh Setup Controls Dialog Box
Now preview the mesh on your circuit layout by clicking on Momentum -> Mesh ->
Preview… as shown in Figure 15.
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Figure 15. Preview the Mesh on your circuit layout.
A Preview Mesh window will pop up as shown in Figure 16.. Enter a Mesh Frequency of 10
GHz and click OK. A status window as shown in Figure 17 will appear.
Figure 16. Mesh Preview pop up window
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Figure 17. Status window for Mesh Preview…
Your layout should now resemble Figure 18.
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Figure 19. Momentum S-parameter simulation
A Simulation Control window will appear as shown in Figure 20. We now have to
specify the S-parameter sweep parameters. PLEASE NOTE: DUE TO THE
COMPLEXITY OF THIS OPERATION IT IS IMPORTANT THAT YOU CHOOSE
“Adaptive” SWEEP AND THAT THE SAMPLE POINTS LIMIT IS SET TO THE
MINIMUM THAT IS NECESSARY. THIS OPERATION CAN TAKE UP TO SEVERAL
HOURS OR DAYS IF TOO MANY POINTS ARE SPECIFIED.
In the Simulation Control menu, choose the “Adaptive” Sweep Type. Enter a Start of
0.5GHz and Stop of 10GHz. Enter a Sample Points Limit of 30. Then, click “Add to
Frequency Plan List” or “Update”.
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Figure 20. Simulation Control Dialog Box
After the frequency sweep plan has been entered. Click the Simulate button to perform a
simulation on the layout. PLEASE NOTE: THIS SIMULATION MAY TAKE SEVERAL
HOURS TO COMPLETE. A status window as shown in Figure 21 will appear and display
the simulation progress.
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2 4 6 80 10
-50
-40
-30
-20
-10
-60
0
Frequency
M a g .
[ d B ]
S21
Figure 22. Simulation Results Comparison, S21
The responses of the Lumped, Distributed and Momentum simulations can be compared
on the same plot as shown in Figure 23 and Figure 24.
m1freq=dB(LPF_lumped..S(2,1))=-3.13
3.300GHz
m2freq=dB(LPF_Radial_Stubs_Momentum0..S(2,1))=-3.0
3.380GHz
m3freq=dB(LPF_Radial_Stubs_Momentum_mom_a..S(2,1))=-3.4
3.386GHz
Lumped
Distributed
Momentum
1 2 3 4 5 6 7 8 90 10
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
-110
0
fr eq, GHz
d B ( L P F
_ l u m p e d . .
S ( 2 , 1
) )
m1
d B ( L P F
_ R a d i a l_ S t u b s_
M o m e n t u m 0 . .
S ( 2 , 1
) )
m2
d B ( L P F
_ R a d i a l_ S t u b s_
M o m e n t u m_
m o m_
a . .
S ( 2 , 1
) )
m3
m1freq=dB(LPF_lumped..S(2,1))=-3.13
3.300GHz
m2freq=dB(LPF_Radial_Stubs_Momentum0..S(2,1))=-3.0
3.380GHz
m3freq=dB(LPF_Radial_Stubs_Momentum_mom_a..S(2,1))=-3.4
3.386GHz
Figure 23. Simulation Results Comparison, S21
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Lumped
Distributed
Momentum
m4freq=dB(LPF_lumped..S(1,1))=-2.887
3.300GHz
m5freq=dB(LPF_Radial_Stubs_Momentum0..S(1,1))=-7.179
3.380GHz
m6freq=dB(LPF_Radial_Stubs_Momentum_mom_a..S(1,1))=-2.627
3.386GHz
1 2 3 4 5 6 7 8 90 10
-30
-20
-10
-40
0
freq, GHz
d B ( L P F_
l u m p e d . .
S ( 1 , 1
) )
m4
d B ( L P F
_ R a d i a l_ S t u b s_
M o m e n t u m 0 . .
S ( 1 ,
1 ) )
m5
d B ( L P F_ R
a d i a l_ S t u b s_
M o m e n t u m_
m o m_
a . . S ( 1 , 1
) )
m6
m4freq=dB(LPF_lumped..S(1,1))=-2.887
3.300GHz
m5freq=dB(LPF_Radial_Stubs_Momentum0..S(1,1))=-7.179
3.380GHz
m6freq=dB(LPF_Radial_Stubs_Momentum_mom_a..S(1,1))=-2.627
3.386GHz
Figure 24. Simulation Results Comparison, S11