压板位置传感器的射频电磁场辐射干扰分析研究

压板位置传感器解决了继电保护及自动装置出口压板位置无法在线监视的难点,但由于压板位置传感器采用了微功率射频通信技术,在运行中会产生一定的电磁场辐射,继电保护及自动装置正常运行是否会受其影响尚未有明确的结论,本文通过理论分析了压板位置传感器的辐射等级和水平,并与相关标准做了比较,最后通过实测分析了其电磁场干扰水平以及对继电保护及自动装置的影响程度。结果表明压板位置传感器不会影响继电保护及自动装置的正常运行,同时能够有效实现压板位置的在线监视。

指纹锁模块的拒识率、误识率及辐射电磁场干扰检测

指纹锁的拒真率、误识率，目前还没有国家标准条款，指纹行业里虽有技术要求，但检测操作很难实现，为此在检测中提出检测方法，实现检测需要。

Electromagnetic emanation exploration in FPGA-based digital design

As semiconductor technologies have been shrinking,the speed of circuits,integration density,and the number of I/O interfaces have been significantly increasing.As a consequence,electromagnetic emanation(EME)becomes a critical issue in digital system designs.Electronic devices must meet electromagnetic compatibility(EMC)requirements to ensure that they operate properly,and safely without interference.I/O buffers consume high currents when they operate.The bonding wires,and lead frames are long enough to play as efficient antennas to radiate electromagnetic interference(EMI).Therefore,I/O switching activities significantly contribute to the EMI.In this paper,we evaluate and analyze the impact of I/O switching activities on the EME.We will change the circuit configurations such as the supply voltage for I/O banks,their switching frequency,driving current,and slew rate.Additionally,a trade-off between the switching frequencies and the number of simultaneous switching outputs(SSOs)is also considered in terms of EME.Moreover,we evaluate the electromagnetic emissions that are associated with the different I/O switching patterns.The results show that the electromagnetic emissions associated I/O switching activities depend strongly on their operating parameters and configurations.All the circuit implementations and measurements are carried out on a Xilinx Spartan-3 FPGA.

指纹系统的一般要求和检测方法

指纹产品目前还没有国家及行业标准。指纹图形研发企业（科研院所）虽有技术要求。但对应用领域的检测很难实现。结合多年锁具及电子锁具的检测实践，分析指纹产品的技术参数及指纹应用领域的具体实际、特编制了指纹系统的一般要求和检测方法。实现其检测需要。实现其产品质量检验和控制，供同行们参考。