The Differential Pair Tuner makes precise length adjustments to the shorter side of a selected set of differential pair traces to equalize their lengths. The shorter of the two traces has serpentines added to it to increase the length.
![](https://i0.wp.com/exactcad.com/images/exp_diff_pair_tuning_02.jpg)
The image below shows an example of the before and after condition of traces which have been tuned with the tool:
![](https://i0.wp.com/exactcad.com/images/exp_diff_pair_tuning_01.png)
Here is a video of the tool working: (best viewed at 1080p, full screen)
Future enhancements to this tool will include:
– Dynamic tuning with the additional length added at each bend in the traces’ path.
– Integration with the Layer Stackup tool in CES and Xpedition to calculate additional length needed on a per-layer basis, along with time-of-flight calculations based on the dielectric materials surrounding the traces.