Modeling the interconnection of a pseudo-differential link using a wide return conductor

A type of pseudo-differential link uses a floating termination circuit connected to an interconnection comprising a return conductor wider than the transmission conductors. For n channels, the link is designed using a per-unit-length (p.u.l.) impedance matrix and a p.u.l admittance matrix, both of size ntimesn. The paper establishes the relationship between this model and an alternative model which uses a p.u.l. impedance matrix and a p.u.l admittance matrix of size (n+1)times(n+1). In the process, we define two vectors which may be used to assess external crosstalk.