GaAs PIN diodes optimized for X-band low loss and high isolation switch application are presented. The impact of diode physical characteristics and electrical parameters on switch performance is discussed. A new struc...GaAs PIN diodes optimized for X-band low loss and high isolation switch application are presented. The impact of diode physical characteristics and electrical parameters on switch performance is discussed. A new structure for GaAs PIN diodes is proposed and the fabrication process is described. GaAs PIN diodes with an on-state resistance of 〈2. 2Ω and off-state capacitance -〈20fF in the range of 100MHz to 12.1GHz are obtained.展开更多
介绍了一款多通道的北斗/GLONASS双模导航信道模块的设计和研制。模块有4个接收下变频通道,可同时接收北斗和GLONASS信号,通过滤波、变频、放大,输出带有限幅功能的中频信号,高隔离度地分离出2种共8路不同模式的导航信号。此外还有2个...介绍了一款多通道的北斗/GLONASS双模导航信道模块的设计和研制。模块有4个接收下变频通道,可同时接收北斗和GLONASS信号,通过滤波、变频、放大,输出带有限幅功能的中频信号,高隔离度地分离出2种共8路不同模式的导航信号。此外还有2个上变频通道,把2个中频信号上变频到北斗和GLONASS频率,混合输出。该模块的通道隔离度达70 d B以上,在输出功率-5 d Bm时,三阶交调达到-60 d Bc,具有良好的线性指标。展开更多
文摘GaAs PIN diodes optimized for X-band low loss and high isolation switch application are presented. The impact of diode physical characteristics and electrical parameters on switch performance is discussed. A new structure for GaAs PIN diodes is proposed and the fabrication process is described. GaAs PIN diodes with an on-state resistance of 〈2. 2Ω and off-state capacitance -〈20fF in the range of 100MHz to 12.1GHz are obtained.
文摘介绍了一款多通道的北斗/GLONASS双模导航信道模块的设计和研制。模块有4个接收下变频通道,可同时接收北斗和GLONASS信号,通过滤波、变频、放大,输出带有限幅功能的中频信号,高隔离度地分离出2种共8路不同模式的导航信号。此外还有2个上变频通道,把2个中频信号上变频到北斗和GLONASS频率,混合输出。该模块的通道隔离度达70 d B以上,在输出功率-5 d Bm时,三阶交调达到-60 d Bc,具有良好的线性指标。
文摘隔离开关自身的复杂运行特征极易出现机械性质的故障,且在高电压情况下,危险系数更高。为了提升整体的安全性,确保诊断效果的可靠,设计了一种基于电机电流检测的高压隔离开关机械故障诊断方法。采用支持向量机(Support Vector Machine,SVM)定子采集隔离开关故障数据,解析开关故障姿态,并设计有载分接开关(OnLoad Tap Changer,OLTC)电机电流转换开关故障诊断模型,通过分合闸拒动诊断高压隔离开关机械故障。测试结果表明,电机电流检测诊断测试组的故障诊断时间相对较短,在诊断工作中的应用效果和价值更高,具有实际的应用价值。
