Modelling noise and delay in VLSI circuits

Abstract

References b Fig. 2 Radialion parterm offlrrsh mounred parch onfenno on rhermnlire slob (2t= I00 mnn) or/,=2.03 GHz U Kplane: ha-planeIn a second experiment, a microstrip patch antenna was attached directly to a thermalite block (440 x 215 x 100 mm) and the dipole-like radiation panems measured in an anechoic chamber. The results given in Figs. 20 and h show the effect of placing radar absorbent material (RAM) on the block ends to absorb the surface wave contribution. With no absorbent material the surface waves result in some secondary radiation at the block ends thus creating a ripple interference pattem. The surface wave excitation is clearly a polarisation-dependent propagation mechanism.Discussion and conc/usions: Surface wave propagation on walls has been theoretically and experimentally demonstrated for some typical building materials. The water content of the material has pronounced effect on the parameters. Field reinforcement near dry wall surfaces is likely to occur in practical WLAN scenarios, both around and within buildings. Ray-tracing and other field prediction techniques may require modification to account for the surface wave fields and the complex interactions taking place. Acknowledg,nents:Helpful discussions with R. Craven (DSTL) and P. Nobles (RMCS) are gratefully acknowledged.

Modeling delay and noise in arbitrarily coupled RC trees

“…Closed-form models for generating second-order transfer functions from each driver to the receiver in arbitrarily coupled resistancecapacitance (RC) trees (such as that shown in Fig. 1) representing the minimum complexity for this class of circuits were recently reported [2], [3]. The summation of all waveforms results in the complete response to all switching events at the node of interest, with no restriction on arrival times, and allows both delay and noise estimations.…”