Accession Number : ADA193821

Title :   Time Domain Wave Propagation in Multilayered Integrated Circuits.

Descriptive Note : Semi-annual report 1 Aug 87-31 Jan 88,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS

Personal Author(s) : Kong, Jin-Au

PDF Url : ADA193821

Report Date : Feb 1988

Pagination or Media Count : 9

Abstract : Many integrated circuits contain strip lines at different heights that run parallel or perpendicular to each other. And we have investigated reliable models for these structures. First the capacitances associated with two offset parallel strips at different heights between ground planes are computed using the conformal mapping approach. As an extension, a simplified circuit of parallel-plate lines with transverse ridges is introduced to model two parallel strips with perpendicularly crossing strips on top. We treated it as a distributed circuit consisting of transmission lines segments with periodical capacitive loading. In order to calculate the coupling between two lines, we reduced this structure to two equivalent single line circuits, viz. the even mode and the odd mode circuits. The Laplace transform approach can be easily applied to find out the transient response. The numerical computation carried out for various environments shows that the crossing strips will cause serious trouble for signals with a rise time of less than 50ps to propagate along a distances of 2cm or longer.

Descriptors :   *INTEGRATED CIRCUITS, *NUMERICAL METHODS AND PROCEDURES, *STRIP TRANSMISSION LINES, CAPACITANCE, CIRCUITS, COMPUTATIONS, CONFORMAL MAPPING, DISTRIBUTION, LAPLACE TRANSFORMATION, LAYERS, MODELS, RELIABILITY, RESPONSE, RIDGES, SIMPLIFICATION, TIME DOMAIN, TRANSIENTS, TRANSMISSION LINES, TRANSVERSE, WAVE PROPAGATION

Subject Categories : Electrical and Electronic Equipment
      Numerical Mathematics

Distribution Statement : APPROVED FOR PUBLIC RELEASE