绝缘油耐压测试仪的设计及抗干扰措施

介绍了采用ATM89C51单片机的绝缘油耐压测试仪工作原理及硬件结构，给出了0－88kV高压电压产生以及绝缘油击穿状态采集方案，提出了具有高可靠性复位电路的实现方法，为提高数据采集的可靠性，经出了抗干扰的具体措施。     

1.0 V low voltage CMOS mixer based on voltage control load technique

A CMOS active mixer based on voltage control load technique which can operate at 1.0 V supply voltage was proposed,and its operation principle,noise and linearity analysis were also presented.Contrary to the conventional Gilbert-type mixer which is based on RF current-commutating,the load impedance in this proposed mixer is controlled by the LO signal,and it has only two stacked transistors at each branch which is suitable for low voltage applications.The mixer was designed and fabricated in 0.18 μm CMOS pr...     

基于GPRS的配变监测系统接入安全技术

分析了APN专线技术和VPN加密认证技术,介绍了通过GPRS将配变监测终端接入电力系统内网的方法。 通过安全性分析证明了APN专线技术和VPN加密认证技术结合运用在GPRS接入系统的可行性。     

应用于subLVDS接口的1.5Gb/s收发器设计

介绍了subLVDS接口的系统结构并给出一种改进的内部收发器实现电路.为了稳定直流工作点,在发送器内部加入与电源电压无关的自偏置电压源和共模负反馈电路;通过轨到轨预放大器,接收器的共模输入电压可以达到电源至地的范围.SMIC0.18μm 1P6M的工艺下,仿真结果表明该系统对随机输入数据的工作速度可以达到1.5Gb/s,工作温度范围为-40～120℃.     

单片机在医院监护系统中的应用

文章介绍了性能优异 ,稳定可靠的单片微型计算机在医院监护系统中的应用 ,给出了该系统的硬件结构及关键问题的处理方法。     

Low power consumption high speed CMOS dual-modulus 15/16 prescaler for optical and wireless communications

Frequency synthesizer is an important part of optical and wireless communication system. Low power comsumption prescaler is one of the most critical unit of frequency synthesizer. For the frequency divider, it must be programmable for channel selection in multi-channel communication systems. A dual-modulus prescaler (DMP) is needed to provide variable division ratios. DMP is considered as a critical power dissipative block since it always operates at full speed. This paper introduces a high speed and low power complementary metal oxide semiconductor (CMOS) 15/16 DMP based on true single-phase-clock (TSPC) and transmission gates (TGs) cell. A conventional TSPC is optimized in terms of devices size, and it is resimulated. The TSPC is used in the synchronous and asynchronous counter. TGs are used in the control logic. The DMP circuit is implemented in 0.18 μm CMOS process. The simulation results are provided. The results show wide operating frequency range from 7.143 MHz to 4.76 GHz and it comsumes 3.625 mW under 1.8 V power supply voltage at 4.76 GHz.     

基于FPGA的高频时钟的分频和分配设计

介绍了为PET(正电子发射断层扫描仪)的前端电子学模块提供时间基准而设计的一种新型高频时钟扇出电路。该电路利用FPGA芯片来实现对高频时钟的分频与分配，并用LVDS传输标准对生成的多路时钟信号进行传输，从而最大程度地减少了输出各路时钟之间的延时偏差，同时利用低压差分信号的传输特性增强了信号的抗干扰能力。文章给出了采用VHDL语言编写的时钟电路程序代码。     

红树莓果醋生产工艺的研究

探讨了以红树莓为原料的果醋生产工艺。通过单因素试验和正交试验确定了红树莓果醋的最佳工艺参数。酒精发酵的最佳工艺条件为发酵温度20℃,果汁的初始糖度16％,酵母菌接种量10％,发酵7d左右。醋酸发酵最佳工艺条件为发酵温度30℃,醋酸菌接种量12％,初始酒精度8％,发酵8d。酿制出的红树莓果醋香味独特,品位纯正。     

改善电动机供电电能质量的新策略

优质电力供应是电动机稳定、可靠运行的重要保证.针对电动机供电系统中存在的主要电能质量问题,介绍了几种电能质量补偿装置的基本结构及工作原理,分析了其关键技术和研究热点.最后,讨论了其应用现状及发展趋势,对用户选择经济合理的装置来配置电力,满足电动机运行对电能质量提出的较高要求具有一定的指导作用.     

红树莓果醋生产工艺的研究

探讨了以红树莓为原料的果醋生产工艺。通过单因素试验和正交试验确定了红树莓果醋的最佳工艺参数。酒精发酵的最佳工艺条件为发酵温度20℃,果汁的初始糖度16％,酵母菌接种量10％,发酵7d左右。醋酸发酵最佳工艺条件为发酵温度30℃,醋酸菌接种量12％,初始酒精度8％,发酵8d。酿制出的红树莓果醋香味独特,品位纯正。