Extraction method for twisted-pair parasitic capacitance and conductance in conductive shell

Abstract

The invention relates to the field of extraction of parasitic parameters in transmission line crosstalk prediction and elimination, and in particular relates to an extraction method for twisted-pair parasitic capacitance and conductance in a conductive shell. The method comprises the following steps of S1, acquiring the variation of a distance h between central axes of a single line to a twisted-pair of a cross section through building a twisted-pair approximate period alternative transmission model, and then acquiring the change of a distance di from a conductor to the conductive shell; S2, extracting a parasitic capacitance schematic diagram through building mirror image replacement to acquire a unit length inductance matrix in a free space of each medium layer L(FS), a unit length inductance matrix in an insulating layer L(INSUL), a unit length complex (real) capacitance matrix in the free space C(FS), and a unit length complex (real) capacitance matrix (shown in the description) inthe insulating layer; and S3, and acquiring an overall composite capacitance matrix (shown in the description) by a series thought, and acquiring parasitic net capacitance C and a net conductive matrix G. According to the method provided by the invention, the parasitic parameters are extracted by using a medium layering thought, and the extracted parasitic parameters are more accurate.

Description

technical field [0001] The invention relates to the field of parasitic parameter extraction in transmission line crosstalk prediction and elimination, in particular to a method for extracting parasitic capacitance and conductance of twisted pair wires in a conductive shell. Background technique [0002] The electromagnetic coupling of the transmission line is reflected in the form of parasitic parameters. In order to realize transmission line crosstalk prediction and crosstalk elimination, the parasitic parameters must be obtained first. The extraction of parasitic parameters per unit length of transmission line is the basis of transmission line crosstalk analysis. The extraction of parasitic parameters is difficult in the extraction of parasitic capacitance and parasitic conductance. [0003] In practice, the electrical parameter per unit length of a classical transmission line is only a simple value, which can be obtained through mature formulas. The common electrical par...

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Problems solved by technology

[0005] In summary, the existing literature reports have not studied the problem of direct extraction of lossy non-uniform twisted pair parasitic capacitance and conductance, and its extraction method still needs to be solved

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