# ApsimRLGC by Applied Simulation Technology

ApsimRLGC is program to calculate the electrical parameters of a transmission line cross section. In particular it calculates the capacitance, inductance, resistance and conductance matrices associated with coupled lossy transmission lines.

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ApsimRLGC is program to calculate the electrical parameters of a transmission line cross section. In particular it calculates the capacitance, inductance, resistance and conductance matrices associated with coupled lossy transmission lines. ;A design engineer is more likely to have the physical description of the transmission line, rather than the electrical parameters in terms of the RLGC matrices. ApsimRLGC therefore contains a program to go from the physical description to the electrical parameters. The input information needed is the physical description in terms of quantities such as the width of the lines, spacing between them, dielectric constant of the substrate, etc. The program creates two files, one with the extension 'mod' and the other with the extension 'out'. The first contains the RLGC matrices in a form that can be directly called from ApsimSPICE as an INCLUDE file. The 'out' file contains general information in human-readable format about the line such as characteristic impedance, attenuation, etc. in addition to the RLGC matrices.;ApsimSPICE is especially suited for the simulation of distributed elements like transmission lines. It uses fast algorithms with efficient time step control for the simulation of transmission lines. Phenomena normally difficult to take care of such as coupling, dielectric loss, and conductor loss (including skin effect) are accounted for. ApsimSPICE expects an electrical description of the coupled transmission line in terms of the following matrices:;R matrix which is the resistance per unit length ;L matrix which is the inductance per unit length ;G matrix which is the conductance per unit length ;C matrix which is the capacitance per unit length ;For single or uncoupled lines these are single numbers rather than matrices. A set of 3 coupled lines, for example, would be represented by four 3 by 3 matrices, one for each of these quantities. R and G model the losses and need not be specified for lossless lines. G represents the loss in the dielectric between the conductors of the transmission line and R represents the resistive loss in the conductors of the transmission line. ;ApsimRLGC can also model some 3-d structures such as vias and some special structures such as coaxial cables.