10-becker Co-simulation Cds.pdf

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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

www.cst.com

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

2

www.cst.com • Oct-07 www.cst.com

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

3

www.cst.com • Oct-07 www.cst.com

Tuning Sliders in CST DS 2008 variable Length

4

www.cst.com • Oct-07 www.cst.com

CST DESIGN STUDIO™ Frequency Domain Matching Networks Combine Results (including circuit behaviour)

5

www.cst.com

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)

www.cst.com

Results of Matching Original return loss

7

Matched antenna (at 1.8 GHz)

www.cst.com

Combine results in CST DS farfield monitors:

Monitors including matching network

matched unmatched

8

www.cst.com

Co-simulation Example: Dual Patch Antenna

9

www.cst.com

CST DESIGN STUDIO™: Connect Ports in Schematic View Add ideal phase shifter

First define global parameter „ph“ in CST DESIGN STUDIO™

10

www.cst.com

Combine Results creates new results in the CST MWS tree

11

www.cst.com

Postprocessing

12

www.cst.com

CST DESIGN STUDIO™ 2008 Time Domain Signal Library New SPICE and IBIS Import Blocks Eye Diagram + TDR

13

www.cst.com

Transient Analysis

14

www.cst.com

Available Time Signals

15

www.cst.com

IBIS Input Block Input buffer Example 5V is the typical driving voltage for the buffer used.

Input voltage (pulse)

16

Current measured at input

www.cst.com • Oct-07 www.cst.com

Example: Eye Diagram Differential Via Pair

17

www.cst.com

Add transmission line sections Switch to CST DESIGN STUDIO ™

Add external ports, transmission lines and probes

set length of transmission lines to 1000 (mils) 18

www.cst.com

Set-up simulation task

19

www.cst.com

Results Run Transient simulation

Differential input

20

Differential output

www.cst.com

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)

21

www.cst.com

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“) 22

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

25

2008? Tuning Sliders? SPICE + IBIS? Layout? Gen Transmission Line Block?

www.cst.com

Preinstalled Examples

26

www.cst.com

CST DESIGN STUDIO Single ended ports for MWS simulation

Add external circuit (ports) in DS

S-parameters (e.g. Differential ports, external circuit) 27

www.cst.com

ENDE 28

www.cst.com

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)

29

www.cst.com

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

30

Transient task

www.cst.com

Transient Co-Simulation of Mixer Application ID 268

3

d=142

Output Signal

2 1 0 -1 -2 -3

0

200

400

600

800

1000

Time / ns 31

www.cst.com

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

www.cst.com

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 33

www.cst.com

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