EM Circuit Co-Simulation with CST DESIGN STUDIO

EM Circuit Co-Simulation with CST DESIGN STUDIO

CST STUDIO SUITE™ 2008
Application and Feature Tutorial
EM Circuit Co-Simulation with
CST DESIGN STUDIO™
New Features 2008
Frequency Domain
- Matching Network
- Combine Results
Time Domain
- IBIS / SPICE
- TDR / Eye Diagram
1 ube / v1.0 / 14. Sep 2007
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New Layout Editor in CST DS 2008
1. Model opens in CST DS
5. 3D Model has changed
2. Edit block properties
3. MWS 3D View
4. Update
model in MWS
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New Blocks in CST DS 2008
IBIS Import Block
Spice Import Block
Support of Berkley Spice
Import of nested submodels possible
Generalized TML Reference Block
Works equivalent to “Generalized Transmission Line Block“;
takes over characteristics from connected MWS block
Connection to parameterized MWS block required
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Tuning Sliders in CST DS 2008
variable
Length
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CST DESIGN STUDIO™
Frequency Domain
Matching Networks
Combine Results (including circuit behaviour)
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Antenna Matching
Perfect match
Serial inductor
External port
6
Inductance
1.8 GHz
Phase shifter or
transmission line
Ideal phase
shifter
50Ω
-58.8°
PIFA Antenna
Results from CST
MWS (3D EM)
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Results of Matching
Original return loss
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Matched antenna (at 1.8 GHz)
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Combine results in CST DS
farfield monitors:
Monitors including
matching network
matched
unmatched
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Co-simulation Example:
Dual Patch Antenna
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CST DESIGN STUDIO™:
Connect Ports in Schematic View
Add ideal phase shifter
First define global parameter „ph“
in CST DESIGN STUDIO™
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Combine Results creates
new results in the CST MWS tree
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Postprocessing
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CST DESIGN STUDIO™ 2008
Time Domain
Signal Library
New SPICE and IBIS Import Blocks
Eye Diagram + TDR
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Transient Analysis
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Available Time Signals
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IBIS Input Block
Input buffer Example
5V is the typical driving voltage
for the buffer used.
Input voltage (pulse)
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Current measured at input
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Example: Eye Diagram
Differential Via Pair
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Add transmission line sections
Switch to CST DESIGN STUDIO ™
Add external ports, transmission lines and
probes
set length of transmission lines to 1000 (mils)
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Set-up simulation task
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Results
Run Transient simulation
Differential input
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Differential output
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SPICE Model can be extracted from any block
Touchstone to SPICE Converter
(multiple blocks can be combined in
a DS-nested block and then converted)
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Shortcuts
SHIFT-O places a monitor/probe
C to create connection lines
P to place an external port
G = ground
SHIFT-R = Resistor
SHIFT-L = Inductor
SHIFT-C = Capacitor
R = rotate block right (clockwise)
L = rotate block left (counterclockwise)
more shortcuts, please check the Online help
(search „shortcut“)
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www.cst.com
CST STUDIO SUITE™ 2008
Application and Feature Tutorial
EM Circuit Co-Simulation with
CST DESIGN STUDIO™
New Features 2008
Frequency Domain
- Matching Network
- Combine Results
Time Domain
- IBIS / SPICE
- TDR / Eye Diagram
23 ube / v1.0 / 14. Sep 2007
www.cst.com
24
www.cst.com
MWS –License; no DS
0 EUR
Block Elements available:
• Phase shifter
• Variable reflection
• Perfect absorber
• 3dB Splitter
• Directional Coupler
• MWS Netlist Block
• MWS Clone Block
• RLC-GND Circuit Elements
Canvas available
Antenna Task
No DS-Frontend
No ParameterSweep
No Optimization
No Caching
2006B: also Touchstone Block included
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2008?
Tuning Sliders?
SPICE + IBIS?
Layout?
Gen Transmission Line Block?
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Preinstalled Examples
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CST DESIGN STUDIO
Single ended ports for MWS simulation
Add external circuit
(ports) in DS
S-parameters
(e.g. Differential ports, external circuit)
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ENDE
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Transient Co-Simulation of Mixer
Application ID 268
180°Hybrid microstrip junction
Integration of active and
system level simulation with
full 3D EM simulation
1GHz signal at RF port,
0.993 GHz signal at LO port,
50 Ω termination at IF port
Optimization of matching
network required
Full 3D CST MWS model of the hybrid mixer (with external diodes)
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Transient Co-Simulation of Mixer
Application ID 268
CST MICROWAVE STUDIO®
Time Domain solver
CST DESIGN STUDIO™
Seamless integration of 3D
EM part and circuit part
Cross-platform optimization
Schematic View of the CST MWS / CST DS Co-Simulation
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Transient task
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Transient Co-Simulation of Mixer
Application ID 268
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d=142
Output Signal
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1
0
-1
-2
-3
0
200
400
600
800
1000
Time / ns
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Transient Co-Simulation of Mixer
Application ID 268
Mixer spectra
0
Power / dBm
-10
-20
CST DS Circuit with Matching Network
-30
-40
-50
0
1
2
3
4
5
6
7
8
9
10
Frequency / Ghz
32
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Transient Co-Simulation of Mixer
Application ID 268
0
-20
S-Paramer in dB
(after matching)
-40
-60
-80
-100
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4
Frequency / Ghz
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