A novel structure of low-voltage trigger silicon-controlled rectifiers(LVTSCRs) with low trigger voltage and high holding voltage is proposed for electrostatic discharge(ESD) protection. The proposed ESD protection de...A novel structure of low-voltage trigger silicon-controlled rectifiers(LVTSCRs) with low trigger voltage and high holding voltage is proposed for electrostatic discharge(ESD) protection. The proposed ESD protection device possesses an ESD implant and a floating structure. This improvement enhances the current discharge capability of the gate-grounded NMOS and weakens the current gain of the silicon-controlled rectifier current path. According to the simulation results, the proposed device retains a low trigger voltage characteristic of LVTSCRs and simultaneously increases the holding voltage to 5.53 V, providing an effective way to meet the ESD protection requirement of the 5 V CMOS process.展开更多
Global Navigation Satellite System(GNSS)vulnerability researches aim to improve GNSS application reliability,and is of great significance to the continuity of positioning,navigation,and timing services.The research on...Global Navigation Satellite System(GNSS)vulnerability researches aim to improve GNSS application reliability,and is of great significance to the continuity of positioning,navigation,and timing services.The research on GNSS vulnerability can be roughly divided into three parts:vulnerability assessment,traceability and substitution.This paper surveys state-ofthe-art GNSS vulnerability research and supplements the vulnerability research system.Under the premise that GNSS is highly vulnerable,a real-time positioning system is designed in which visual fiducial markers is used to assist visual-inertial odometry.The experiment using simulation data as observation data proves that the method proposed in this paper can effectively reduce the positioning error in visual-inertial odometry.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 61904110)。
文摘A novel structure of low-voltage trigger silicon-controlled rectifiers(LVTSCRs) with low trigger voltage and high holding voltage is proposed for electrostatic discharge(ESD) protection. The proposed ESD protection device possesses an ESD implant and a floating structure. This improvement enhances the current discharge capability of the gate-grounded NMOS and weakens the current gain of the silicon-controlled rectifier current path. According to the simulation results, the proposed device retains a low trigger voltage characteristic of LVTSCRs and simultaneously increases the holding voltage to 5.53 V, providing an effective way to meet the ESD protection requirement of the 5 V CMOS process.
文摘Global Navigation Satellite System(GNSS)vulnerability researches aim to improve GNSS application reliability,and is of great significance to the continuity of positioning,navigation,and timing services.The research on GNSS vulnerability can be roughly divided into three parts:vulnerability assessment,traceability and substitution.This paper surveys state-ofthe-art GNSS vulnerability research and supplements the vulnerability research system.Under the premise that GNSS is highly vulnerable,a real-time positioning system is designed in which visual fiducial markers is used to assist visual-inertial odometry.The experiment using simulation data as observation data proves that the method proposed in this paper can effectively reduce the positioning error in visual-inertial odometry.
