Post on 07-May-2018
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CST STUDIO SUITE™ 2008Application 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
ube / v1.0 / 14. Sep 2007
www.cst.com2 www.cst.com • Oct-07
New Layout Editor in CST DS 2008
1. Model opens in CST DS
3. MWS 3D View5. 3D Model has changed
2. Edit block properties
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
www.cst.com • Oct-07
www.cst.com4 www.cst.com • Oct-07
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
1.8 GHz
Phase shifter ortransmission lineSerial inductor
Perfect match
Results from CST MWS (3D EM)
Ideal phaseshifter
InductanceExternal port
-58.8°50Ω
PIFA Antenna
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Results of Matching
Original return loss Matched antenna (at 1.8 GHz)
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Combine results in CST DSfarfield monitors:
Monitors includingmatching network
unmatched
matched
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Co-simulation Example: Dual Patch Antenna
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CST DESIGN STUDIO™:Connect Ports in Schematic View
First define global parameter „ph“in CST DESIGN STUDIO™
Add ideal phase shifter
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Combine Results createsnew results in the CST MWS tree
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Postprocessing
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CST DESIGN STUDIO™ 2008Time 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
www.cst.com16 www.cst.com • Oct-07
IBIS Input BlockInput buffer Example
5V is the typical driving voltage for the buffer used.
Input voltage (pulse) 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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ResultsRun Transient simulation
Differential input 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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CST STUDIO SUITE™ 2008Application 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
ube / v1.0 / 14. Sep 2007
24 www.cst.com24
25 www.cst.com25
MWS –License; no DS0 EUR
Canvas available Antenna Task No DS-Frontend No ParameterSweep No Optimization No Caching
Block Elements available:
• Phase shifter• Variable reflection• Perfect absorber• 3dB Splitter• Directional Coupler• MWS Netlist Block• MWS Clone Block • RLC-GND Circuit Elements
2006B: also Touchstone Block included
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 MixerApplication 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 ext ernal 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
Transient task Schematic View of the CST MWS / CST DS Co-Simulatio n
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Transient Co-Simulation of Mixer Application ID 268
0 200 400 600 800 1000
Time / ns
3
2
1
0
-1
-2
-3
Out
put S
igna
l
d=142
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Transient Co-Simulation of Mixer Application ID 268
CST DS Circuit with Matching Network
0 1 2 3 4 5 6 7 8 9 10
Frequency / Ghz
0
-10
-20
-30
-40
-50
Pow
er /
dBm
Mixer spectra
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Transient Co-Simulation of Mixer Application ID 268
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
(after matching)
S-P
aram
er in
dB
0
-20
-40
-60
-80
-100