Design Force offers easier controlled impedance routing for high frequency signals using electromagnetic field solvers.
Controlled impedance routing is a prerequisite for good digital circuit signal integrity, and signals – particularly high frequency ones – require constant characteristic impedance from driver to receiver. Renishaw uses Zuken’s CR-8000 suite for controlling impedance. Constraint Manager is used to specify the limits of characteristic impedance and Lightning is used to create impedance templates. This allows them to select a group of nets, using a net class, and then use the field solver to automatically calculate the impedance specified – adjusting the track widths to match.