一种高速片内电流监控器实现

静态电流(IDDQ)测试的实现方法研究是IDDQ测试领域的重要内容之一,高速、高精度是共同追求的目标。通过分析测试向量改变时流过被测电路的电源电流变化情况,得出制约IDDQ测试速度的主要因素。基于此,采用CMOS0.5μm工艺参数、SPICE仿真工具和模拟集成电路设计规则,提出一种快速、高精度的BICS(片内电流监控器)的设计方案。设计中利用辅助的PMOS开关管和延迟电路,有效地解决测试速度问题。设计出的电路达到了100MHz的测试速率、1A测量精度、500mV的最大电源电压降、50μA以上的故障电流检测能力,可以满足一定的实际应用需要。     

Dynamic characterization of Built-In Current Sensors based on PN junctions: Analysis and experiments

The goal of this work is to analyze the performance of PN junction-based Built-in Current Sensors (BICS) for I _DDQ testing. Two types of BIC Sensors are analyzed: one based on a simple PN junction as the sensing element (DBICS), and the other based on a lateral BJT (PBICS). The sensitivity, speed and performance of the BICS are studied by showing their dependence on circuit parameters. Design constraints of such sensors in order to achieve performance criteria on CUT and BICS are analyzed. The dynamic analysis of the BICS is compared with experimental results when the PN junction BICS are used on a CMOS circuit.     

Design and Realization of a Built-In Current Sensor for IDDQ Testing and Power Dissipation Measurement

Built-in current sensor (BICS) is known to enhance test accuracy, defect coverage of quiescent current (I_DDQ) testing method in CMOS VLSI circuits. For new deep-submicron technologies, BICSs become essential for accurate and practical I_DDQ testing. This paper presents a new BICS suitable for power dissipation measurement and I_DDQ testing. Although the BICS presented in this paper is dedicated to submicron technologies that require reduced supply voltage, it can also be used for applications and technologies requiring normal supply voltage. The proposed BICS has been extended for on-line measurement of the power dissipation using only an additional capacitor. Power dissipation measurement is important for safety-critical applications and battery-powered systems. A simple self-test approach to verify the functionality and accuracy of BICSs has also been introduced. The proposed BICS has been implemented and tested using an N-well CMOS 1.2 m technology. Practical results demonstrate that a very good measurement accuracy can be achieved.     

有限流保护功能的霍尔电流传感器

简单介绍了闭环式霍尔电流传感器的工作原理,在其基础上提出了一种限流保护电路,使得霍尔电流传感器原边电流过载时输出电流钳位,保障其满足3倍甚至更高倍过载要求,并通过了试验验证.     

光学电流传感器的实现方案及其现状

介绍了光学电流传感器的实现原理,各种光学电流传感器的实现方案及其各自的优缺点,同时提 出目前影响光学电流传感器商用化的几个问题及其相应的解决措施。     

一种基于电涡流传感器的数据采集系统

论述并分析了电涡流传感器的基本原理，设计了同被测件相应的电涡流传感器，并完成了测量电路、接口电路的设计和调试，从而完成了基于电涡流传感器的数据采集系统设计。该类系统可用于自动售货机币值的判别和生产线扁平金属工件的多信息采集及自动控制，由于是多信息采集，系统具有更高的准确性。     

A Passive Optical Fiber Current Sensor Based on YIG

A research on passive optical fiber current sensor based on magneto-optical crystal and a new design of light path of the sensor head are presented. Both methods of dual-channel optical detection of the polarization state of the output light and signal processing are proposed. Signal processing can obtain the linear output of the current measurement of the wire more conveniently. Theoretical analysis on the magnetooptical fiber current sensor is given, followed by experiments. After that, further analysis is made according to the results, which leads to clarifying the exiting problems and their placements.     

Design of ICs applying built-in current testing

Built-in Current (BIC) sensors have proven to be very useful in testing static CMOS ICs. In a number of experimental ICs BIC sensors were able to detect small abnormal I _DDQ currents. This paper discusses the design of the circuit under test and Built-in Current (BIC) sensors, which provide: maximum level of defect detectability, minimum impact of BIC sensor on the performance of the circuit under test and minimum area overhead needed for BIC sensors implementation.This research was supported by NSF Grant MIP8822805.     

Current Testing Procedure for Deep Submicron Devices

This paper presents a test technique that employs two different supply voltages for the same IDDQ pattern. The results of the two measurements are subtracted in order to eliminate the inherent sub-threshold leakage. Summary of the experiment carried out on System on a Chip (SOC) device build in 0.35 technology is also shown. These experiments proved that the method is effective in detecting failures not detectable with the single limit IDDQ.     

高灵敏度的光磁式电流传感器

介绍了结构上带气隙的园环铁芯,采用新型传感元件设计的法拉第效应光磁式电流传感器.该传感器元件是一块经过精细研磨的玻璃棱镜,棱镜的两端面有高反射能力的镀层,经棱镜传播的光束在玻璃/空气界面上会进行20次的临界反射.新设计的电流传感器,其灵敏度比基于类似原理的原设计产品几乎高3倍.     

光纤电流传感器及其研究现状

本文介绍了光纤电流传感器的分类及其测量原理，光纤电流传感器的研究和实用化过程中的核心问题，同时介绍了在这些研究方面取得的新进展。     

全光纤电流传感器目前及今后的发展

本文介绍了全光纤电流传感器的基本原理及目前存在的主要问题,并叙述了提高其稳定性的技术方案和今后的发展。     

有精准偏置电压输出的霍尔电流传感器

通过介绍开环式霍尔电流传感器的工作原理,在此基础上提出了一种可以输出精准直流偏置电压的直流霍尔电流传感器电路,并通过试验进行了验证.     

全光纤型光纤电流传感器长期稳定性的实验研究

本文报道了我们对于全光纤型光纤电流传感器试验样机在户外进行长期稳定性实验的结果。主要是环境温度的起伏对系统各部分的影响。实验结果表明:全光纤型光纤电流传感器其长期稳定性不能满足0.5％测量精度的要求,其主要原因是光纤质量不稳定,长期使用后其性能有较大变化。     

霍尔电流传感器在家用电器电气参数测试中的应用

首先介绍了霍尔器件及两种工作模式的霍尔电流传感器的基本工作原理，然后说明了已研制成功的两种智能化测试仪器——热态电气强度测试仪和接地电阻测试仪的结构组成与应用情况。     

A new BICS for CMOS operational amplifiers by using oscillation test techniques

In this paper, we present a built-in current sensor to test operational amplifiers that takes advantage of previous results where the negative supply current has been taken as the test observable using the Oscillation-test technique. The sensor is applied to a variable-length chain of OTAs considering an exhaustive analysis of catastrophic defects (opens, shorts), Gate Oxide Short and Floating Gate defects. We analyse the sensitivity of both frequency and amplitude of the current consumption. Results show that the proposed sensor provides 97% fault coverage, as the previous results suggested.     

一种检测冗余故障的瞬态电流测试方法

数字电路中的冗余故障是不能被传统的电压测试方法(VoltageTesting)和稳态电流测试方法(IDDQTest-ing)检测出来的。根据瞬态电流测试(IDDQTesting)的思想,提出一种检测冗余故障的方法,该方法利用扇出重汇聚结构当中从扇出点到重汇聚点的不同路径的延迟差,在重汇聚点形成冒险,以激活故障并进行传播。实验表明,此方法能够有效地检测冗余故障。