Co-Simulation Tuning Methods for Lumped Element Filters
Newman, P
EADS Astrium

This paper discusses a novel simulation and tuning technique for lumped element filtering, using Agilent's Advanced Design System and Agilent's Momentum package, where Momentum simulations are performed to give information on parasitic capacitance.

This paper details the process of taking the Momentum simulation and entering the design back into the schematic environment, in order to bring together the physical layout and SMT components to gain an accurate representation of filter performance. Co-simulation with layout components can break down the barriers between electrical and physical analysis domains.

A step-by-step simulation tuning process can be performed, with the addition of each filter component to the layout, with comparisons between Co-Simulation and Schematic responses. It is possible to empirically tune the filter step by step.

The paper shows how the co-simulation has taken into account any additional capacitive parasitics, which are then subsequently tuned out until the two responses match. This method has shown great success.

This paper shows a clear design example of this process. PCBs have been manufactured, and a design example shown. Results have shown excellent matches between simulation and measured responses.

This technique can be applied for simpler filters up to 1GHz, and the co-simulation technique can be used for many other RF applications.