An improved dipole-moment model based on near-field scanning for characterizing near-field coupling and far-field radiation from an IC .

摘要

Radio Frequency Interference (RFI) problems are critical issues in wireless platform design. The accurate noise model of integrated circuits (ICs) is needed to help designers to diagnose and predict RFI problems. In this dissertation, an improved IC radiated emission model based on near-field measurements IS proposed. The regularization technique and the truncated SVD method are employed together with the least square method to calculate the dipole moments from the near-field data. This dipole model has clear physical meaning: the electric and magnetic dipoles represent the voltage and the current in the circuit, respectively.;One application of this dipole model is the prediction of heat sink radiation. In order to accurately predict the fields excited by a heat sink, an approach is proposed in this paper to include the exact excitation of the heat sink, which is described by some dipole moments constructed from the near-field scanning of the integrated circuit beneath the heat sink.;Another contribution of the work is the proposal of effective dielectric properties of layered media for cavity model applications. With the effective properties, the cavity model can be generalized for either parallel plates or metal enclosures containing multiple dielectric layers.;In the fourth paper a unified s-parameter (multimode s-parameter) representation for a multiport passive structure is proposed. Both mixed-mode and single-ended s-parameters are included in the unified representation, which makes it more convenient to characterize structures.