System and method for automatic selection of transmission line macromodels
AssigneeInternational Business Machines Corporation
InventorIbrahim M. Elfadel
Life of this patent
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Abstract
Transmission line macromodels can be classified into main categories of delay-extraction and rational approximation. The exponential solution of the Telegrapher's Equation is used to create a system and method that enable a time-domain circuit simulator to automatically select the most appropriate macromodel for a given transmission line structure.
Claims20
A computer modeling system comprising:
- a processor that has at least one input that receives parameters related to one or more electrical transmission lines, the parameters representing one or more physical characteristics and one or more electrical characteristics of the one or more electrical transmission lines;
- a database with a set of one or more macromodels that in which the processor is arranged to apply the parameters in a simulation to determine an electrical behavior of one or more of the electrical transmission lines;
- and
- an automatic selection process controlled by the processor that selects a macromodel from the set of macromodels to simulate one or more of the electrical transmission lines, the selection of the macromodel being determined by one of 1) comparing a total distortion to an error threshold and 2) comparing a length of the transmission line to a critical length calculated from the parameters,
- wherein the processor provides a generated transmission line macromodel corresponding to the selected macromodel to an electrical circuit simulator program.
A computer readable medium embodied with a computer program of machine-readable instructions executable by a digital processing apparatus to perform operations to automatically select a macromodel from a set of macromodels for use in simulating a transmission line, the operations comprising:
- providing input parameters of per-unit-length resistance (R), per-unit-length inductance (L), per-unit-length conductance (G), per-unit-length capacitance (C), length (d), and maximum operating frequency (ωmax);
- computing total distortion (ΔT) from the input parameters;
- providing an error threshold (e);
- comparing the total distortion with the error threshold;
- automatically selecting a macromodel based upon whether the total distortion is more or less than the error threshold.
A computer readable medium embodied with a computer program of machine-readable instructions executable by a digital processing apparatus to perform operations to automatically select a macromodel from a set of macromodels for use in simulating a transmission line, the operations comprising:
- providing input parameters of per-unit-length resistance (R), per-unit-length capacitance (C), length (d), and maximum operating frequency (ωmax), and error threshold (ε);
- computing a critical length (dcritical) from the input parameters;
- comparing the length of the transmission line with the critical length;
- automatically selecting a macromodel based upon whether the length of the transmission line is less than or greater than the critical length.
Dependencies are inferred from the claim text.