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IC PackageSPICE Model Extraction Examples
General Description
This example shows the extraction of a SPICE compatible network model based on the S-parameter calculation of an arbitrary IC package. The model consists of a silicon chip which is encapsulated within a nonconductive plastic compound. The surface mounted package is soldered to printed circuit board with a PEC ground layer.
Structure Generation
The package is created by boolean and chamfer operations. The pins are defined by means of extruded profiles and multiple transformations. Loft operations are used to model the traces to the silicon chip inside the package. The entire row of pins is then rotated and mirrored. The silicon chip is modelled as a substrate with a ground layer. Finally the printed circuit board is modelled as a substrate with the electric boundary as the ground layer.
Solver Setup
Before the network parameter extraction can be started, the excitation sources have to be defined. To define the discrete ports in an efficient way, a local VBA macro is used. The macro generates a discrete port between each picked point and the ground plane defined by the z-coordinate of the last picked point. First, ports 1..52 are defined at the pins outside of the package. Then the connections from the metal pin traces to the silicon chip are modelled as bond wires. Ports 101..152 are created with a second macro-call at the ends of the bond wires. Through the Post Processing:
Signal Post Processing
A network model is extracted from existing S-Parameters. Pressing the Calculate button starts this process. If no S-Parameter result is present a solver run is performed for every wire (three times in this case), exciting every wire once.
Post Processing
Using the excitation of discrete ports, the resulting time signals are automatically converted into the corresponding scattering parameters. They are listed in the navigation tree in the folder "1D Results" and show the transmission behavior of the device, concerning effects like reflection and crosstalk. Based on these calculated S-parameters a SPICE compatible network model is derived consisting of three cascades of lumped elements. The calculated values of these elements can be shown
by pressing the Show results
button in the Post Processing:
Signal Post Processing The option Create Netlist uses these values to create a SPICE-compatible netlist. This netlist is then imported into a CST DESIGN STUDIO simulation project "Spice netlist simulation" as a "SPICE import block" and a SPICE calculation is performed. The resulting S-Parameters can be accessed via the S-Parameters entry in the navigation tree.
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