在高速PCB设计中,信号完整性问题是不可避免的。而借助于仿真工具参与PCB的设计可以极大提高产品一次成功率。本文简要阐述了信号完整性的反射、串扰及电源完整性问题,借助于Allegro PCB SI GXL、Allegro PCB PI option XL及Sig Xplore...在高速PCB设计中,信号完整性问题是不可避免的。而借助于仿真工具参与PCB的设计可以极大提高产品一次成功率。本文简要阐述了信号完整性的反射、串扰及电源完整性问题,借助于Allegro PCB SI GXL、Allegro PCB PI option XL及Sig Xplorer仿真组件对高速AD/DA系统应用实例进行了定量仿真与分析,验证了常见SI问题的正确性,提出了优化PCB设计的解决方案。展开更多
The seismoelectric effects induced from the coupling of the seismic wave field and the electromagnetic field depend on the physical properties of the reservoir rocks. We built an experimental apparatus to measure the ...The seismoelectric effects induced from the coupling of the seismic wave field and the electromagnetic field depend on the physical properties of the reservoir rocks. We built an experimental apparatus to measure the seismoelectric effects in saturated sandstone samples. We recorded the seismoelectric signals induced by P-waves and studied the attenuation of the seismoelectric signals induced at the sandstone interface. The analysis of the seismoelectric effects suggests that the minimization of the potential difference between the reference potential and the baseline potential of the seismoelectric disturbance area is critical to the accuracy of the seismoelectric measurements and greatly improves the detectability of the seismoelectric signals. The experimental results confirmed that the seismoelectric coupling of the seismic wave field and the electromagnetic field is induced when seismic wave propagating in a fluid-saturated porous medium. The amplitudes of the seismoelectric signals decrease linearly with increasing distance between the source and the interface, and decay exponentially with increasing distance between the receiver and the interface. The seismoelectric response of sandstone samples with different permeabilities suggests that the seismoelectric response is directly related to permeability, which should help obtaining the permeability of reservoirs in the future.展开更多
文摘在高速PCB设计中,信号完整性问题是不可避免的。而借助于仿真工具参与PCB的设计可以极大提高产品一次成功率。本文简要阐述了信号完整性的反射、串扰及电源完整性问题,借助于Allegro PCB SI GXL、Allegro PCB PI option XL及Sig Xplorer仿真组件对高速AD/DA系统应用实例进行了定量仿真与分析,验证了常见SI问题的正确性,提出了优化PCB设计的解决方案。
基金supported by the National Science and Technology Major Project(No.2016ZX05018-005)the New Methods,New Technology Research of Geophysical Prospecting(No.2014A-3612)
文摘The seismoelectric effects induced from the coupling of the seismic wave field and the electromagnetic field depend on the physical properties of the reservoir rocks. We built an experimental apparatus to measure the seismoelectric effects in saturated sandstone samples. We recorded the seismoelectric signals induced by P-waves and studied the attenuation of the seismoelectric signals induced at the sandstone interface. The analysis of the seismoelectric effects suggests that the minimization of the potential difference between the reference potential and the baseline potential of the seismoelectric disturbance area is critical to the accuracy of the seismoelectric measurements and greatly improves the detectability of the seismoelectric signals. The experimental results confirmed that the seismoelectric coupling of the seismic wave field and the electromagnetic field is induced when seismic wave propagating in a fluid-saturated porous medium. The amplitudes of the seismoelectric signals decrease linearly with increasing distance between the source and the interface, and decay exponentially with increasing distance between the receiver and the interface. The seismoelectric response of sandstone samples with different permeabilities suggests that the seismoelectric response is directly related to permeability, which should help obtaining the permeability of reservoirs in the future.
