共查询到19条相似文献,搜索用时 62 毫秒
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本文介绍了利用通常器件构成的一种低成本模拟乘法器。分析了其工作原理和应用条件.最后给出了具体的实现电路。 相似文献
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基于生物免疫系统的信息处理机理,介绍了被动免疫算法的实现过程,并将其应用到某装备电路板的故障诊断之中。该算法具有边检测边学习的动态调整功能,仿真和实验实例表明,该算法适合于电路板的故障诊断,有较高的故障诊断率。 相似文献
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基于AD9923A的ICX274模拟前端电路设计 总被引:1,自引:0,他引:1
ICX274是SONY公司生产的每秒15帧200万像素高速CCD,针对ICX274的模拟前端电路(Analog front end,AFE),本文给出了基于Analog Devices公司芯片AD9923的硬件电路和寄存器设置方法.AD9923芯片内部功能电路模块通过SPI接口控制相关寄存器实现,通过分析AD9923内部主要电路模块的工作原理,介绍了与之相关电路的寄存器控制方法.对比SONY方案可以看出,该设计硬件结构简单、成本低、可靠性高.测试表明,驱动时序控制满足ICX274时序要求,可以驱动ICX274输出模拟视频信号,能正确控制相关双采样电路的采样时刻,完成模拟数字转换得到CCD的数字视频信号. 相似文献
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A translinear circuit for sinusoidal frequency division, by an integer number, is presented. The circuit uses no inductors, no capacitors, no analog multipliers and is, therefore, attractive for integration. Simulation results are included. 相似文献
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The effects of sintering temperature on microstructural evolution and electrical characteristics of screen printed Cu patterns were observed. A commercial conducting paste containing Cu nanoparticles was screen printed onto a sodalime wafer sintered under a sintering temperature range of 300 degrees C to 450 degrees C. A network analyzer and Cascade's probe system in the frequency range of 10 MHz to 20 GHz were employed to measure the S-parameters of the sintered Cu conducting patterns. From the measured S-parameters, the insertion losses in high frequencies decreased with increasing sintering temperature due to the formation of an interparticle necking after heat treatment at high temperatures. However, oxidation of Cu nanoparticles during the sintering deteriorated the RF performance of the circuits, resulting large deviation of the S-parameters from the simulated curves. 相似文献
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差分跳频是一种新的扩展频谱通信技术.在介绍差分跳频基本原理的基础上,将差分跳频的频率跳变过程建模成齐次马尔可夫链.分析了G函数的功能,重点讨论了差分跳频码性能的检验方法,包括不可约性、频隙滞留、均匀性和随机性检验,其中频隙滞留是首次提出应用于差分跳频码性能的检验.这些检验方法对于差分跳频G函数的设计具有一定的指导意义. 相似文献
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LabVIEW在时间频率计量测试中的应用 总被引:2,自引:2,他引:0
介绍了一种利用LabVIEW和测量仪器中的程控功能实现对时间频率计量参数的自动测量方法,并结合LabSQL实现了数据的实时存储、分析与处理. 相似文献
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With the recent development of static inverters using thyristors (silicon controlled rectifiers), many extensive attempts have been made to use them as adjustable frequency sources with the aim of realizing simple and accurate speed control systems of ac motors. For these applications, we have developed the improved inverter which has an auxiliary commutation circuit and a feedback current transformer. The auxiliary commutation circuit functions to improve the commutation characteristics and operation reliability, while the feedback current transformer improves the efficiency and stability. The distinguished characteristics of this new inverter have been proved by the experimental drives of induction motors and synchronous motors in wide frequency ranges. 相似文献
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Yang-Hun Kim Su-Kil Lee Hyun-Man Jang Young-Woong Kim Keun-Tae Lee Chang-Youl Choi Cheol-Hwi Ryu Han-Joong Kim Si-Dole Hwang Hyung-Suk Yang Song-Ho Sohn Ji-Hyun Lim 《低温学》2012,52(12):661-666
The 22.9 kV/50 MVA AC HTS power cable system consisted of power cable with 410 m length and cryogenic system has been manufactured by LS Cable & System and installed in Icheon substation of KEPCO grid in the end of 2010. High temperature superconductor only appears the superconductivity at the constant temperate range. So in order to maintain the superconductivity, the cryogenic system is needed. The cryogenic system, the open-loop type, is consisted of the Pressure Control System (PCS), Gas/liquid separator, Circulation Pump, Decompression unit, Filter and so on. Decompression unit is a device that keeps the sub-cooled nitrogen by way of the latent heat of evaporation and includes the heat exchanger. The effectiveness-NTU method is used for the design of the heat exchanger. After installation of the cryogenic system on the site, the test of the cooling capacity of the cryogenic system and commissioning tests were performed. During the grid operation of the HTS power cable system, no major problems have been encountered to this point. The cryogenic system has been operated sufficiently to maintain a stable of the HTS power cable system. This paper will summarize the design of the cryogenic system and the results of the grid operation. 相似文献