Transferring controlled impedance parameters between the SB200 and the Si8000


Application Note 179

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The SB200 incorporates the facility to add controlled impedance structures to a layer in the stackup. The SB200 is integrated with the Polar Instruments Si8000 Controlled Impedance Field Solver so controlled impedance values for a structure may be calculated at the click of a button.

Structure parameters may be copied to the Si8000 Quick Solver for processing (for example by the Si8000 Goal Seeking function) and calculated values pasted back to the SB200 for insertion into the stackup.

This application note outlines the process of exchanging controlled impedance parameters between the SB200 and the Si8000 to add a controlled impedance structure with the correct impedance value to a stackup layer.

1. Check you are using SB200 Version 2.00 and Si8000m Version 3.00.

2. Start both the SB200 and the Si8000 applications.

3. Select the SB200 and open a sample stackup.

4. Select (click on) an electrical layer let's say Layer 1.

Stackup 3-D view

(Hint its easier to do this if you select 2d view from the icon on the toolbar first).

Stackup 2-D view

5. Select the controlled impedance tab (note the blue plus sign appears).

Controlled Impedance tab

6. Add a structure let's say a coated microstrip .

SB200 Structure Control Dialog

Copy and paste icons (for exchanging parameters with the Si8000) should appear on the right of the SB200 toolbar.

Copy/Paste parameter buttons

7. Set a target impedance in the box at the bottom of the Controlled Impedance section (in this case 50 Ohms).

SB200 Controlled Impedance Window

8. Add parameter values for Trace Width, etc. as required.

9. Use the Copy to icon to paste to the Si8000 Clipboard (left hand icon with red arrow)

10. Select the Si8000 Application.

11. Use the (right hand) Paste From SB200 button to paste the controlled impedance parameters from the SB200
(The Si8000 should automatically load the correct structure) check the correct units are selected.

Si8000 parameter pane

12. Goal seek for line width... (Click the Lower Trace Width button if you cannot meet target you need to go back and adjust the stackup).

13. Copy the parameters back to the SB200 using the Copy to SB200 button and switch back to the SB200... where you can paste the information (Paste From Si8000) back into the stack.

14.  With the Si8000 parameters returned to the SB200 select the Calculate button Calculate to recalculate the current structure.

 
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Polar Instruments 2004. Polar Instruments pursues a policy of continuous improvement. The specifications in this document may therefore be changed without notice. All trademarks recognised.