W. Zamboni

A Transmission-Line Model for Full-Wave Analysis of Mixed-Mode Propagation

The paper presents a generalized transmission line model able to describe the high-frequency mixed-mode propagation along electrical interconnects. The model is derived from a full-wave formulation and extends the validity of the standard transmission line (TL) model to frequency ranges where the propagation is no longer of transmission electron microscopy (TEM)-type. This generalized TL model describes the high-frequency differential and common mode propagation and the mode conversion. Within its validity limits, the proposed model provides solutions in good agreement with those obtained through full-wave models. Case studies are carried out to evaluate the high-frequency mode conversion in asymmetric interconnects.

Metallic Carbon Nanotube Interconnects, Part I: a Fluid Model and a 3D Integral Formulation

This paper illustrates the inclusion, in a 3D integral formulation of Maxwell equations, of a fluid model for the study of the electrodynamics of metallic carbon nanotubes in the frequency domain. The effective conduction electrons are modeled as an infinitesimally thin cylindrical layer of compressible fluid, whose dynamics are described by means of the linearized Eulers equation. The resulting integral equations are solved numerically by the finite element method, using the facet elements and the null-pinv decomposition. The proposed formulation is applied to study carbon nanotubes interconnects

Metallic Carbon Nanotube Interconnects, Part II: a Transmission Line Model

In this paper a transmission line model is derived to describe the propagation along single-wall carbon nanotubes, candidate to be used as interconnects in nanoelectronics applications. The model is obtained in a consistent way from a fluid model of the electron conduction along such a nanostructure. The per-unit-length parameters are strongly dependent on the effects related to the electron inertia and the quantum fluid pressure. The values of the signal propagation velocity, characteristic impedance and characteristic damping of the obtained transmission line are very different from that obtainable, in principle, by ideally scaling the conventional technology. A successful benchmark test with a full-wave model is presented and some case-studies are carried out to investigate the possibility to use such structures as the future interconnects

3-D Numerical Modeling and Circuit Extraction Techniques for the Analysis of Unshielded Twisted Pairs

A three-dimensional full-wave surface integral formulation is used to predict the terminal response of unshielded twisted pairs. The proposed approach allows taking into account the skin effect, proximity effect and radiation losses. The proposed full-wave simulation is validated by comparing the results with those obtained by a software tool based on the finite integration technique, discussing advantages and limitations. The surface integral formulation results obtained on a short length of the line are used to predict the behavior of a longer line. In addition, they are used to extract equivalent circuits suitable for the time domain analysis by any commercial circuit simulator

Analysis of Multiwall Carbon Nanotubes Using a Three-Dimensional Integral Formulation and a Fluid Model

In this paper, we use a fluid model to describe the dynamics of the conduction electrons of multiwall carbon nanotubes. A 3-D integral formulation of Maxwells equations is used and numerically solved with a finite-elements approach based on div-conforming basis functions. The null-pinv decomposition is used to avoid the low-frequency breakdown.

Analysis of resistive joints for superconducting cables for fusion applications

In this paper, we use an integral formulation of the Maxwells equations (magneto-quasi-static limit) in the presence of superconductors to analyze a resistive joint for cables of interest for controlled thermonuclear fusion

Evaluation of Crosstalk in High-Frequency Interconnects with an Enhanced Transmission Line Model

In this paper the crosstalk noise in high-frequency interconnects is analyzed through a model able to carry out full-wave analysis while retaining the same simplicity of a transmission line model

Signal integrity analysis of high-speed interconnects through a full-wave transmission line model

An enhanced transmission line model has been recently proposed by the authors to perform the frequency-domain full-wave analysis of high-speed interconnects operating in non-TEM condition. Here this model is used to investigate the effects of such operating conditions on the time-domain signal waveforms. The interconnects are described by a reduced-order model, obtained by using the vector fitting method to identify its Z-parameters. The time-domain analysis of the performance of some case-studies highlights degradation of the signal, due to the effects of radiation loss and finite-length dispersion. The solution of the ETL model provides useful indications to control such degradation.

Broad-Band Characterization of Conductors with Arbitrary Topology Using a Surface Integral Formulation

In this paper a surface integral formulation is used for the terminal characterization in huge frequency ranges of conducting bodies, with an automatic treatment of complex topologies