A Low-Loss Built-In Current Sensor

This paper presents a novel built-in current sensor that uses two additional power supply voltages besides the system power supply voltage, and that is constructed by using a current mirror circuit to pick up an abnormal IDDQ. It is activated only by an abnormal quiescent power supply current and minimizes the voltage drop at the terminal of the circuit under test. Simulation results showed that it could detect 16-A IDDQ against 0.03-V voltage drop at 3.3-V VDD and that it reduced performance degradation in the circuit under test. It is therefore suitable for testing low-voltage integrated circuits. Moreover, we verified the behavior of the sensor circuit implemented on the board by using discrete devices. Experimental results showed that the real circuit of the sensor functioned properly.     

Why ‘Current Mode’ Does Not Guarantee Good Performance

It is often said that there is a fundamental difference between current-mode and voltage-mode circuits. This conjecture is discussed in technical and philosophical terms, and it is shown that there is no such performance difference to be found, and that it is not possible to make a clear divide between voltage mode and current mode.And yet performance differences appear in the literature. It is shown that they come from the different design practices of the current-mode and the voltage-mode research groups. The conclusion of this paper is that the practical knowledge of the current-mode research groups should be re-integrated into main-stream IC design, and that all propaganda of the type current-mode is better than voltage-mode should be stopped immediately.     

F-TRIA01: A Fast Bipolar Transimpedance Amplifier

This paper describes a new transimpedance amplifier for fast current pulses delivered by high energy particle detectors. The choice of a bipolar technology allowed a 100 low input impedance and a rise time down to 1 nS. The fully differential current mode architecture provides an excellent linearity and a large versatility as for its transimpedance, bandwidth and power consumption.     

OC门限流电路在串励电机控制中的研究

针对传统的以霍尔加磁环对电机电流进行检测再保护的电流限制的方法,提出了0C门硬件限流电路,该电路突破了传统的思路,不对电流进行采样,直接通过硬件电路对电机电流进行限州保护,即以设定的最大电流通过开关管所产生的压降作为0C门电路的参考值,以实际电流通过开关管所产生的压降作为比较值与参考值进行比较。当实际电流大于设定的最大电流时,0C门电路的输出关闭驱动开关管的控制电路,从而关断开关管,反之,当实际电流小于最大电流时,开关管正常工作,从而实现了对过电流进行快速的限制保护,确保了保护电路中的电流不会超过设定的最大电流。应用结果表明,该电路具有响应时间短,控制精度高,成本低等特点。所以其具有较高的应用推广价值。     

光电电流互感器测试与校验方法

本文分析了光电电流互感器的测试与校验的方法,阐述了光电电流互感器的结构和工作原理,并对光电电流互感器的测试系统进行了研究,同时还对光电电流互感器的虚拟校验仪进行了说明,最后总结了光电电流互感器测试与校验方法的要点,旨在研究出适合光电电流互感器的测试发展,从而推动光电电流互感器的发展和应用.     

基于Sagnac干涉的光纤对冲床脉动电流计量技术的研究

基于Sagnac干涉原理的全光纤光电互感器具有响应特性好、精度高、安全性好的特性,是解决脉动电流测量的新技术之一。以J21-40T普通冲床为研究对象,应用光波的偏振性和法拉第磁光效应理论,探究了全光纤光电互感器测量冲床脉动电流的工作机理。通过对Sagnac调制技术的全面分析,设计了系统框图。借助测量数据,阐述了测量重复性、温度变化、1／4波片、Verdet常数误差。研究结果表明：这一技术可以普遍用于冲床脉动电流的准确测量,是一种有效的大电流计量技术。     

Electronically tunable sinusoidal oscillator circuit with current and voltage outputs

A new circuit configuration for the realisation of an electronically tunable sinusoidal oscillator is presented. The proposed circuit uses only one current backward transconductance amplifier (CBTA), two grounded capacitors and one resistor. Using current controlled CBTA (CC-CBTA) instead of the CBTA, the resistor can be completely removed. It has also current-mode (CM) and voltage-mode (VM) outputs, simultaneously. The workability of the proposed structure has been demonstrated by both simulation and experimental results.     

Bi-2223/Ag-sheathed tape processing studies

The production of high critical current density J_c Bi-2223/Ag sheathed conductors is a complex process involving interactions among many different parameters. The effects of three factors: 1) powder production path, 2) the first sinter temperature, and 3) the subsequent sinter temperatures were investigated. Statistical methods were used to design the experiment and interpret the results. Transport J_c was the main response for the analysis, but microstructural results were also used to assess the physical basis for the differences in performance. The powder variable had the largest main effect with only very weak main effects for the other factors.     

全机械扫描强流离子注入机重复性研究

对影响全机械扫描强流离子注入机剂量重复性的因素进行了分析。对束流纹波的影响建立了数学模型，计算了束流纹波对剂量重复性的影响。结果表明只要束流纹波在9％以内，剂量重复性可控制在1％以下。     

成品油管道杂散电流干扰的防护

文章分析了珠三角成品油管道工程沿线主要杂散电流的干扰源,针时不同干扰源对管道产生腐蚀的影响及防护措施进行了论述。指出在管道建成后,应以科学的态度,在实测数据的基础上, 运用技术和管理相结合的方法,采取综合治理的措施对管道进行防护,以确保管道安全平稳运行。