2
Introduction
Transmission lines are used to propagate digital and analog signals, and as frequency domain
components in microwave design. Transmission lines are used for varied applications, including:
Power transmission line
Telephone lines
Traces on Printed Circuit Boards
Traces on Multi-Chip Modules
Traces on Integrated Circuit Packages
OrCAD PSpice contains distributed and lumped lossy transmission lines that can help to improve the
reliability of many applications. For analog and digital circuits, there is a need to examine signal quality
for a printed circuit board and cables in a system. For analog circuits, the frequency response of circuits
with transmission lines can be analyzed. It is the purpose of this article to examine the steps and issues
involved in modeling and analyzing transmission lines in PSpice.
Applications Flowchart
The analysis of transmission line nets requires multiple steps. These steps are given in the following
flowchart:
Figure 1. Analysis flowchart for transmission line nets.
This article provides information for the two center blocks, by discussing relevant devices and models in
PSpice, along with specific modeling techniques and examples.
