Time Domain Wave Propagation in Multilayered Integrated Circuits.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1988
- Accession Number
- ADA193821
Entities
People
- Jin-au Kong
Organizations
- Massachusetts Institute of Technology