Getting Start with Agilent - ADS Software.
Dr. Haim Matzner, Shimshon Levy and Dafna Ackerman.
July 2008.
2
CONTENTS
0.1
Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3
1 Background
1.1 The Searching Option . . . . . . . . . . . . . . . . . . . . . . .
5
5
2 Experiment Procedure
9
2.1 Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 T Attenuator Simulation . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Transmission Line Simulation . . . . . . . . . . . . . . . . . . . 12
0.1 Objectives
Upon completion of the study, the student will become familiar with the following topics:
1. Understanding the ability of the Agilent-ADS software.
2. Designing basic lumped circuits by applying the Agilent-ADS software.
CONTENTS
3
4
CONTENTS
1. BACKGROUND
Agilent ADS is a leading software for designing and optimizing RF and microwave circuits. When applying the software one can draw a circuit, choose
components from the software data base or data-sheet of many manufacturers, simulate and optimize the circuit and draw output S parameters or other
graghs of the design.
1.1 The Searching Option
For finding a specific component, click on the ’Display Component Library
List’ button, as shown in Figure 1.
Figure 1 - ’Display Component Library List’ button.
A component library window should be opened. Press on the ’Find Component(s)’ button, as shown in Fgure 2.
BACKGROUND
5
Figure 2 - The component library window
A ’Find’ window should be open, as shown in figure 3. Type the name of the
desired component in the ’Find’ tab. Pay attention that the ’Look in:’ tab is
marked as ’All’ (searching option for all ADS directories).
Figure 3 - Find component.
Another way for searching a component is to write its exact name in the components tab, as shown in Figure 4.
6
BACKGROUND
Figure 4 - Searching a component by its exact name.
A manual searching option is also available by searching the component in the
components categories, as shown in Figure 5.
Figure 5 - Components categories.
THE SEARCHING OPTION
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8
BACKGROUND
2. EXPERIMENT PROCEDURE
2.1 Required Equipment
ADS software installed on a PC computer.
2.2 T Attenuator Simulation
1. Double click on the ADS icon. The main window will open. Open a new
project, by pressing File - New Project, as shown in Figure 1.
Figure 1 - Creating a new window.
Fill in a project name and change the units for the project to mm, as shown
in Figure 2.
Figure 2 - New project.
EXPERIMENT PROCEDURE
9
2. New schematic window will be open. Draw a T attenuator, as shown in
Figure 3.
3. A 10 dB T-Attenuator, which is also a matching network between 50Ω
system and 75Ω system. All the components are taken from different categories
in the left side of the window (see table-1).
4. Set the frequencies range for 1M Hz − 500MHz, by double clicking on
the S-PARAMETRS icon. Set the parameters of the substrate (FR4 in our
case) by double clicking the MSub icon.
S-PARAMETERS
S_Param
SP1
Start=1 MHz
Stop=500 MHz
Step=1.0 MHz
P_1Tone
PORT1
Num=1
Z=50 Ohm
MSub
MSUB
MSub1
H=1.6 mm
Er=4.7
Mur=1
Cond=1.0E+50
Hu=1.0e+033 mm
T=17 um
TanD=0.002
MLIN
TL1
Subst="MSub1"
W=3 mm
L=50 mm
R
R1
R=18 Ohm
N
N
Zin
Zin
Zin
Zin1
Zin1=zin(S11,PortZ1)
Zin
Zin2
Zin2=zin(S22,PortZ2)
R
R2
R
R=48 Ohm
R3
R=43 Ohm
MLIN
TL2
Subst="MSub1"
W=1.3 mm
L=50 mm
Term
Term2
Num=2
Z=75 Ohm
Figure 3 - T - Attenuator simulation
Component Name
Description
Msub
Microstrip substrate
Terminaton
Term
MLIN
Microstrip Line
Zin
Port Input Impedance
R
Resistor
S-Parameters
S-parameter Simulation
P_1Tone
Power Source
Table-1, list for Figure 3
Categories List
TLines-Microstrip
Simulation S_param
TLines-Microstrip
Simulation S_Param
Lumped Components
Simulation S_Param
Sources-Freq Domain
5. Simulate the circuit by clicking on the yellow tooth wheel icon. A debug
window will be opened, as shown in Figure 4. Pay attention that there is not
any error in the Summary section.
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EXPERIMENT PROCEDURE
Figure 4 - Debug window.
6. After performing the simulation the results window open, choose the
’Rectangular Plot’ button, as shown in Figure 5.
Figure 5 - ’Rectangular Plot’ button.
T ATTENUATOR SIMULATION
11
An options window will be open, choose a parameter (e.g. S(2,1)), click on
the button ’Add Vs...’, choose the data units (in this case, dB), select the
independent variable (in this case, freq) and press ’OK’. You should get, in
the results window, a graph, as shown in Figure 6.
Figure 6 - Results window.
7. Draw the following graphs : S21 (dB) (the attenuation) versus frequency,
S11 (dB) (input return loss) and S22 (dB) (output return loss) versus frequency,
|Zin | and |Zout | (magnitude of the input and output impedances) versus frequency.
2.3 Transmission Line Simulation
1. Draw a 50Ω transmission line terminated by 50Ω load, as shown in Figure
7.
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EXPERIMENT PROCEDURE
S-PARAMETERS
MSub
PARAMETER SWEEP
S_Param
SP1
Freq=1.0 GHz
MSUB
MSub1
H=1.6 mm
Er=4.7
Mur=1
Cond=1.0E+50
Hu=1.0e+033 m m
T=17 um
TanD=0.02
Rough=0 mm
Var
Eqn
ParamSweep
Sweep1
SweepVar="X"
Sim InstanceName[1]="SP1"
Sim InstanceName[2]=
Sim InstanceName[3]=
Sim InstanceName[4]=
Sim InstanceName[5]=
Sim InstanceName[6]=
Start=0
Stop=160
Step=0.5
VAR
VAR1
X=1.0
N
Zin
Zin
Zin1
Zin1=zin(S11,PortZ1)
Term
Term 2
Num=2
Z=50 Ohm
MLIN
TL1
Subst="MSub1"
W=2.88 mm
L=X mm
Term
Term1
Num=1
Z=50 Ohm
Figure 7 - 50 ohm trasmission line.
Component Name
Description
Categories List
Msub
Microstrip substrate
TLines-Microstrip
Terminaton
Term
Simulation S_param
MLIN
Microstrip Line
TL-Microstrip
Zin
Port Input Impedance
Simulation S_Param
S-Parameters
S-parameter Simulation
Simulation S_Param
P_1Tone
Power Source
Sources-Freq Domain
Parameter Sweep
Swept parameter simulation Simulation S_Param
Table-2, list for Figure 7
2. Draw the following graphs : S21 (dB) (attenuation) versus the length X,
Zin (input impedance) versus the length X and S21 (phase) (phase response)
versus the length X, as shown in Figures 8 and 9.
0.0
dB(S(2,1))
-0.1
-0.2
-0.3
-0.4
-0.5
0
20
40
60
80
100
120
140
160
X
Figure 8 - Attenuation versus the length X.
TRANSMISSION LINE SIMULATION
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phase(S(2,1))
200
100
0
-100
-200
0
20
40
60
80
100
120
140
160
X
Figure 9 - Phase response versus the length X.
3. Draw a 50Ω transmission line terminated by a short, as shown in Figure 10.
S-PARAMETERS
MSub
MSUB
MSub1
H=1.6 mm
Er=4.7
Mur=1
Cond=1.0E+50
Hu=1.0e+033 mm
T=17 um
TanD=0.02
Rough=0 mm
S_Param
SP1
Freq=1.0 GHz
Var
Eqn
VAR
VAR1
X=1.0
PARAMETER SWEEP
ParamSweep
Sweep1
SweepVar="X"
SimInstanceName[1]="SP1"
SimInstanceName[2]=
SimInstanceName[3]=
SimInstanceName[4]=
SimInstanceName[5]=
SimInstanceName[6]=
Start=0
Stop=160
Step=0.5
N
Zin
Zin
Zin1
Zin1=zin(S11,PortZ1)
Term
Term1
Num=1
Z=50 Ohm
MLIN
TL1
Subst="MSub1"
W=2.88 mm
L=X mm
Term
Term2
Num=2
Z=0.001 mOhm
Figure 10 - 50 ohm trasmission line terminated by a short.
4. Draw the following graphs: the attenuation, S21 (dB), versus the length
X, the input impedance, Zin , versus the length X and the phase response,
S21 (phase), versus the length X.
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EXPERIMENT PROCEDURE