Schematic based simulations are very flexible and accurate in ADS. With the corresponding KnowHow the critical nets can be found and resembled with a schematic. However, sometimes this is not enough. In this case a 2.5D extraction of the critical circuit provides the required accuracy.

Below is an example for a 3-coupled line extraction from a Registered DIMM. The simulation based on this extracted S-parameter set contains the effect of non-ideal referencing as well as the layout accurate X-talk information. On the left picture the whole topology is shown, on the right there is a zoom-in to see more detail

The second example is a 9-coupled line model where DQ and CA signals on different layers are simulated together to evaluate layout accurate layer to layer X-talk.

The last example shows a large package substrate. A 345-port S-parameter file was extracted which includes all Signal and Power/Ground ports. For simulation purposes this huge model was reduced to the ports of interest!