摘要:

A computer-efficient algorithm to determine the parasitic capacitances and inductances associated with high-density multilevel interconnections on GaAs-based integrated circuits is presented. The self and coupling interconnection capacitances have been determined by an efficient and more flexible network analogue method developed for the finite dimension interconnection configurations as well as by the method of moments in conjunction with a Green's function appropriate for the geometry of the interconnection lines. The Green's function was obtained by using the method of multiple images. The results include the fringing fields as well as the shielding by the neighboring interconnections. For a given set of the interconnection dimensions, the algorithm takes less than 30 seconds of computer processing time on a mainframe computer equipped with a math co-processor. The algorithm has been used to study the dependences of the interconnection capacitances and inductances on the interconnection parameters such as their length, width, interlevel distances, separation and the substrate thickness for a system of parallel single-, bi-, and tri-level interconnections printed on or embedded in the GaAs substrate.

ISSN:0920-5071    

DOI:10.1163/156939391X00202

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

This paper describes a rigorous numerical approach for characterizing coplanar waveguide (CPW) discontinuities. This approach develops an integral equation for the unknown electric field distribution on the slot apertures and then solves it numerically in the space domain using the method of moments (SDIE). As a demonstration, this method is applied to derive frequency dependent equivalent circuits for the case of a short-end slotline, a short- and an open-end CPW. In addition, the S-parameters of a CPW stub are computed as a demonstration of a two port discontinuity. It is shown that a shorted slotline and a shorted coplanar waveguide always behave as inductive loads. However, in the case of an open-end coplanar waveguide the even and odd excitations create different effects. Specifically, the even excitation corresponds to an inductive load while the odd excitation to a capacitive one. The results derived by the SDIE method have been extensively studied for numerical convergence and have been compared to other available theoretical or experimental data. The agreement is very good.

ISSN:0920-5071    

DOI:10.1163/156939391X00211

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

摘要:

Prospective study of the influence of superconducting strips in various coplanar waveguides is proposed using a transmission line model designed in an engineering purpose for CAD programs. This model is tested using a comparison of the results obtained, with the propagation characteristics of superconducting coplanar lines determined with a modified spectral domain approach. For insulating coplanar waveguides the use of YBaCuO instead of classical low temperature NbN superconductor provides lower losses at higher operating temperatures. In superconducting MIS or Schottky contact lines, superconductor losses are negligible as compared to semiconductor losses for transverse dimensions as low as 1 μ. For example, 1 μ gate length FET type structures operated at 77 K exhibit 50 Ω constant characteristic impedance with associated constant slowing factor, and losses lower than 4 dB/mm up to 20 GHz. Similar propagation characteristics can be obtained with different superconductors providing that current transport in superconductor is dominated by the kinetic inductance effect. The influence of temperature is also discussed.

ISSN:0920-5071    

DOI:10.1163/156939391X00220

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

ISSN:0920-5071    

DOI:10.1163/156939391X00239

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor

ISSN:0920-5071    

DOI:10.1163/156939391X00248

出版商:Taylor & Francis Group    

年代:1991

数据来源: Taylor