Analysis of crosstalk and field coupling to lossy MTLs in a SPICE environment

Abstract

This paper proposes a circuit model for lossy multiconductor transmission lines (MTL's) suitable for implementation in modern SPICE simulators, as well as in any simulator supporting differential operators. The model includes the effects of a uniform or nonuniform disturbing field illuminating the line and is especially devised for the transient simulation of electrically long wideband interconnects with frequency dependent per-unitlength parameters. The MTL is characterized by its transient matched scattering responses, which are computed including both dc and skin losses by means of a specific algorithm for the inversion of the Laplace Transform. The line characteristics are then represented in terms of differential operators and ideal delays to improve the numerical efficiency and to simplify the coding of the model in existing simulators. The model can be successfully applied to many kinds of interconnects ranging from micrometric high-resistivity metallizations to low-loss PCB's and cables, and can be considered a practical extension of the widely appreciated lossless MTL SPICE model, of which maintains the simplicity and efficiency.

Theoretical and experimental analysis of electromagnetic coupling into microwave circuit

“…We are focuses in the nonlinear comportment of the MESFET in common-source configuration, whose drain is connected to a grounded resistor RL. In Figure 2 shown, we adopt his intrinsic large signal taken from [17], [18]: Figure 2. Equivalent circuit of intrinsic large-signal model of MESFET Where the nonlinearities in this model are represented by gate-source capacitance and drain-source current [19], [20] :…”

Simulation of the coupling of the external electromagnetic field to PCB traces in the SPICE simulator

“…1). Next, the incident electric field is converted into distributed voltage and current sources located along the lines(see, for example, [1]). Such lines are called multiconductor (n-wire) active lossy transmission lines (ALTLs).…”

“…Coupling of the electromagnetic field to interconnections and wired communication systems is an essential issue when investigating the electromagnetic compatibility of an electronic device [1][2][3][4][5][6][7]. In the design phase it is already important to ensure the proper functioning of such devices under realistic conditions, for example, within an industrial environment or near a broadcasting station or a cellular telephone, where a certain electromagnetic interference level exists.…”

Fast EMI analysis of massively coupled interconnects with long delay

“…The MoC was extended to include field coupling to the lines [3], by adding sources representing the field coupling to the matched scattering parameter formulation of transmission lines. The scattering parameter formulation for a single line with an incident field can be written as [3,25]…”

“…To solve this mixed frequency-time problem, several time domain macromodels that approximate the solution of Telegrapher's equations have been proposed [2][3][4][5].…”