Cross-talk and ringing on a multilayer PCB

A description is given of a new release of Greenfield, a family of analog simulation software tools that simulate the behavior of multilayer printed-circuit boards (PCBs) under high-speed switching conditions. Per unit length inductance, capacitance and resistance matrices-for systems of coupled multiconductor microstrips and striplines-are produced by the two-dimensional Green's function boundary-element field solver Greenfield2d. Greenfield2d supports generation of different SPICE subcircuit models of coupled transmission lines. These models can be subsequently used in Phyllis or any tool which supports SPICE netlist syntax. Cross-sections of multiconductor structures including stripline, microstrip and no-ground connections are shown. The boundary-element procedure is used to generate circuit models for these electromagnetically coupled structures. Time-domain signals and cross-talk waveforms are shown in the time domain.<>