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A stochastic model for a simplified high-speed channel is proposed, which considers six key sources of variations. Based on the model, the polynomial chaos (PC) method is applied to quantify the uncertainties. The effectiveness of the PC method is validated by the Monte Carlo (MC) method. Through the variation analysis, the most significant factor affecting a certain output can be identified, which...
For 25 Gbps (clock frequency exceeding ∼10 GHz) on-board signals, where the channel link becomes significantly noisy, active-circuit compensation techniques (e.g., pre-emphasis, adaptive equalization, etc.) are used to flatten the roll-off of the channel's insertion loss, to increase the signal-to-noise ratio (SNR). Due to the fact that these active circuits usually need the response of the channel...
In this paper, we describe a systematic approach to optimize and analyze the equivalent characteristic impedance of practical via structures. The procedure consists of (a) optimizing via structures for impedance matching using a Genetic algorithm, and (b) numerically characterize, by stochastic collocation method, the sensitivity of the equivalent characteristic impedance to the manufacturing uncertainties...
This paper presents an efficient technique to evaluate the propagation characteristics of PCB traces with periodic roughness. This technique is based on the application of the array-scanning-method finite-different time-domain technique in which only a single periodic element needs to be modeled. Numerical examples are used to demonstrate the effectiveness and efficiency of this approach.
Numerical investigations are performed to investigate the interactions between vehicular mounted antennas and an implantable medical device in the vicinity of the vehicular. From the studies, it is shown that higher electromagnetic energy deposition was found in the vicinity of the devices. In addition, it is observed that for higher frequency, emission from vehicular antenna will have stronger interference...
In this paper, an optimization procedure is proposed to design the maximum loss for composite material at multiple frequencies using multiphase spherical particles. This approach is based on a genetic algorithm together with the Maxwell-Garnett formulas. Once initial designs are completed, more accurate finite-difference method will be used to evaluate the designs. This approach can also be used to...
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