International Business Machines Corporation
Single-ended-mode to mixed-mode transformer spice circuit model for high-speed system signal integrity simulations

Abstract:

A method of forming a mixed mode response from a single ended mode input includes modeling a first voltage controlled current source based on relative values of a v.sub.positive input signal and a v.sub.negative input signal and modeling a second voltage controlled current source based on relative values of the v.sub.positive input signal and the v.sub.negative input signal. A method of forming a single ended mode response from a mixed mode input modeling a first voltage controlled current source based on relative values of a v.sub.DIFFin input signal and a v.sub.COMMin input signal and modeling a second voltage controlled current source based on relative values of the v.sub.DIFFin input signal and the v.sub.COMMin input signal, the second voltage controlled being connected to ground through a second terminating impedance that is equal to the reference impedance (Z.sub.0).