Improving S-Parameter Simulation Speed

In ADS, you can increase simulation speed by including a LinearCollapse component in circuits where a Parameter Sweep controller is driving an S-parameter simulation.

Library: Simulation-S_Param > LinearNet

Parameters

Setup Dialog Name	Parameter Name	Description
NetworkRepresentation	NetworkRepresentation	Choose S-Parameters (default) or Y-Parameters to characterize the collapsed linear network.

The LinearCollapse component groups and collapses the linear devices that are not being swept. The collapsed network containing the linear devices is characterized at the frequency points of interest and the equivalent network parameter is used in its place.

The increase in simulation speed is due to the fact that the characterization of the collapsed network happens only once and the data is reused for the rest of the simulation. When a ParamSweep controller is driving an S-parameter analysis, it is common in a large network that most of the network is not being altered by the parameter sweep. By using a LinearCollapse component, instead of solving the linear network at each sweep point, the simulator solves the linear network once, then the simulator reuses the characterized data in place of the linear network.

When adding a LinearCollapse component:

• Place the LinearCollapse component inside each sub-circuit that can be collapsed. You can place only one LinearCollapse component in a sub-circuit.
• Once the LinearCollapse components are placed inside the sub-circuits of interest, then continue with a normal S-parameter simulation.