Pulse Propagation in High-Speed Digital Circuits

摘要

In this effort, we have developed several techniques for the computation of the characteristic impedance as well as capacitance and inductance matrices for a number of different types of transmission-line constructions, e.g., stripline, microstrip line, buried microstrip line and orthogonal line. We have also investigated methods for measuring the high frequency characteristics of planar transmission lines which may, in general, be lossy. The capacitance and inductance matrices have been employed in a computer program that analyzes an n-line system terminated with digital devices, both for the loss-less and lossy cases. The finite element method and the method of moments have been applied to the problem of computing the equivalent circuits of connectors, interconnects and other discontinuities in planar transmission lines, e.g., the bend, the tapered line and the through-hole via. These equivalent circuits have been used to predict the pulse propagation in pc boards involving sections of uniform lines combined with discontinuities mentioned above. (RH)