PCB stackup, signal integrity and controlled impedance Software and test systems for PCB assembly and repair

Si8000m Designsystem

The Si8000m is a boundary element method field solver that builds on the familiar easy to use user interface in earlier Polar impedance design systems. The Si8000m adds enhanced modelling to predict the finished impedance of multiple dielectric PCB builds and also takes into account the local variations in dielectric constant on close spaced differential structures.

 PCB Controlled Impedance Field Solver for single and multiple dielectric PCBs

What's new in the Si8000m?

  • Import and chart logged impedance data from CITS
  • Copy / Paste structure parameters (permits easy comparison of coated / non coated etc.)
  • Crosshatch return path modelling
  • Inbuilt sensitivity graphing
  • Coarse and fine Impedance Goal seeking
  • Model multiple dielectric PCBs
  • Link to PCB stackup Speedstack enhanced with Projects
  • Via stub checks
  • Via pad/antipad coaxial calculation




  • Powerful impedance design system
  • Impedance Goal seeking
  • Model multiple dielectric PCBs
  • 16 Single ended structures
  • 27 Differential structures
  • 36 Single ended coplanar structures
  • 36 Differential coplanar structures
  • Reduce time to market
  • Graph production variations
  • Single ended and differential modelling
  • Calculate the effect of resin rich areas
  • Enhanced soldermask models
  • Optional track resistance calculator

Brochure download

Si8000m – comprehensive modeling of over 100 structures

Surface coating is often overlooked when modelling and the Si8000m models the resist thickness adjacent to above and between surface traces. This offers a much more elegant solution which can be tailored to the particular resist application method in use on your boards. The new Si8000m also extracts even and common mode impedance. (Even mode impedance is defined as the characteristic impedance of one side of a transmission line pair when both lines are driven by a signal of equal magnitude and polarity). It is becoming increasingly necessary to control these characteristics on  high speed systems such as USB2.0 and LVDS.


Field solving Impedance design system

The Field Solvers in the Si8000m allow you accurately to graph impedance against various PCB parameters. The Si8000m Controlled Impedance Design System is a comprehensive controlled impedance design aid which can run stand alone as a Quicksolver, or the underlying engine can be applied directly though the optional Microsoft Excel user interface.


The Si8000m allows you to produce impedance controlled boards with maximum yields. You can also use the Si8000 to reduce the number of prototype iterations before production ramp up.


How? You have 2 powerful methods of using the field solvers.


One: A quick solving calculator lets you seek a target impedance by varying any one parameter, it could be line width, stack height or Er; you choose the variable and set the goal seek – you can even set realistic targets for your own production limits. Use the Edit / Copy to Excel to take values from the Quick solver and paste directly into the Si8000m Excel spreadsheet


Two: With the Si Excel option, a package of Microsoft® Excel spreadsheets allows direct access to the field solvers; you can graph any parameter you choose using the pre-prepared Microsoft Excel workbooks or build your own workbooks to model your process.


With the ever increasing speeds of modern circuitry the demand for high quality controlled impedance printed circuit boards is continuing to grow. Today's PCBs are not just simple electrical interconnection devices, they are complex highly specified components in their own right. As the demand for controlled impedance PCBs has risen there has been a subsequent increase in requirement to verify these board designs prior to manufacture.


  • Differential Impedance PCB Structures
  • Single Ended Impedance Modeling
  • Microstrip and Stripline Constructions
  • Field solver employs Boundary Element Method (BEM)
  • Model soldermask thickness between and adjacent to tracks
  • CITS, Atlas, Touchstone data import and charting


The Si8000m field solving impedance design system offers advanced field solving methods to model most circuit designs and is totally complementary to the CITS500s and RITS520a manual and automatic Controlled Impedance Test Systems. CITS measurement systems have been in use with leading PCB manufactures throughout the world since 1991 and Polar is recognised as a world leader in production line impedance testing. Polar's innovative product portfolio includes the Toneohm 950 short circuit locator which is able to pinpoint the physical location of shorts between maximum copper layers.


Monte Carlo impedance analysis – predicting production spread of trace impedance

For designers and board fabricators wishing to predict the outcome of the board manufacturing process Monte Carlo impedance analysis in Si8000m and Si9000e makes light work of simulating impedance variation in a production run of PCBs.


Si8000m optiones:


XFE optionprovides crosshatch return path modelling for flex and flex-rigid PCBs

Si Crosstalk option –  Multi line and differential pair (lossless) crosstalk – models coupling between traces

Si Excel Interface optionMicrosoft Excel® interface option for lossless calculations in Si8000m/Si9000e

Projects option with Speedstack saves structure groups



Please take a look at the controlled impedance Application Notes – you will gain maximum benefit from your Si8000m if you read these supporting notes. These brief articles help you translate the precision output of the field solvers into practical real world PCBs with good production yields. Ask us about support packages for your Si8000m.





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Interlocal Centre, #07-23

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+65 6873 7470 / +65 6873 7470

Fax +65 6872 7471




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