镜像电流源原理及其应用电路

本文简要介绍了由运算放大器构成的镜像电流源的基本原理，并演化出多种应用电路，可为使用者提供选择和参考。     

基于电流传输器的检测电路的研究

本文探讨了一种基于电流模技术的小电阻变量测量电路,该电路由电流传输器和运算放大器构成.其设计方案降低了电桥电路的复杂性,输出信号是传统桥式电路的四倍,能适用于多个传感器的检测而不需增加额外电路.实现了利用电流模技术设计的电流传输器对传统电阻桥电路的改进.设计的电路结构简单、精度高、功耗低,在电子测量、仪器仪表等实际应用中具有推广和使用价值.     

改进型电流模乘/除器

文中介绍基于跨导线性电路改进的由NPN管构成的电流模乘/除器电路,突破NPN管和PNP管共同构成的电流模乘/除器.借助Pspice对其进行直流扫描分析、温度扫描分析和非线性度分析.经证明此电路是一种性能良好的可集成成较高精度的模拟电流模电路.     

高压电流模降压型DC-DC变换器的电流采样电路

本文针对高压应用电流模Buck DC-DC变换器,提出了一种新颖的片上电流采样电路。该电路结构简单,易于集成,采用LDMOS使应用电压高达25V。使能部分的设计有效防止了开关动作期间电感电流瞬态过冲造成的影响。提出的采样电路已经应用在一款基于0.35μm CDMOS工艺设计的单片电流模Buck DC-DC变换器中。HSPICE仿真结果表明,在5~25V的电源电压范围内,设计电路实现了电感电流的精确采样。     

电流传输器实现的新型理想接地电感器

采用零器技术提出了两种基于电流传输器的理想接地电感实现电路。该电路结构简单，只用两块CCⅡ及3个接地无源元件，模拟电感受CC器件的非理想因素影响小且可由3个接地无源元件独立调节。研究表明，该电路中等效电感的无源灵敏度低、对有源参数变化不敏感。将该电路应用于二阶高通滤波电路中，并进行了计算机仿真和硬件实验研究，结果证实了本文提出的理想接地电感实现方案的正确性。     

IGBT故障电流限制电路

高效且能承受长的短路时间的ＩＧＢＴ的市场在不断增长。现有的器件不能使器件设计者同时实现这两个目标。本文推荐的电路通过限制故障电流的幅值，延长了高效ＩＧＢＴ的短路承受时间。限制故障电流幅值获得的另一个好处是减小了关断时的瞬态电压，尤其对大电流模块更是如此。此外很大程度上抵消了不利的米勒效应。当故障电流是瞬态窄脉冲时，能使电路恢复正常工作，对噪声干扰严重的系统，本限流电路具有特别理想的特性。     

开关电源中电流检测电路的探讨

介绍电流检测电路的实验方法,并探讨在电流检测中常遇见的电流互感器饱和、逼边电流下垂的问题,最后用实验结果分析了升压电路中电流检测的方法。     

一款电流模控制电荷泵的设计及其稳定性分析

设计了一款电流模控制电荷泵,它与传统的电压模控制电荷泵相比具有更好的稳定性。该电路基于TSMC 0.6um标准CMOS工艺进行设计, Spectre仿真结果表明,电路在10mA~100mA全负载范围内增益较高,输出极点一直为主极点,且相位裕度大于60°,输出可以稳定在-7V并具有很好的稳定性及负载瞬态响应特性     

Current‐mode wave field programmable analogue arrays

A new configurable analogue block (CAB), the key element in the design of field programmable analogue arrays (FPAAs), is introduced in this paper. This CAB is based on wave equivalents of the passive elements and it is easily reconfigurable resulting in very simple and versatile FPAA structures. The proposed topology employs a minimum number of switches in the signal path due to the absence of the interconnection network required in other FPAA structures, and thus an improved performance is achieved in comparison with the already introduced corresponding programmable configurations. Copyright © 2008 John Wiley & Sons, Ltd.     

Current‐mode filters based on current mirror arrays

A technique is proposed for obtaining current‐mode filters based on current mirror arrays that operate as unity gain current amplifiers. These amplifiers by properly driving capacitors realize active lossless integrators which are the basic active elements for the derivation of filters according to the leapfrog method. Due to the fact that both the structure of the amplifiers and the adapted method for filter design are simple, the proposed technique is attractive for filter design and implementation. A design and the implementation of two third‐order low‐pass filters are presented. The array of the amplifiers has been implemented in a 0.8 µm CMOS technology. Copyright © 2007 John Wiley & Sons, Ltd.     

Design of current‐mode MOSFET‐C filters using OTRAs

In this paper, third‐order current‐mode MOSFET‐C filters that use operational transresistance amplifiers (OTRAs) with little parasitic capacitance effects are presented. On the basis of the proposed systematic method and design procedure, we can efficiently synthesize third‐order active filters with OTRAs along with simplified MOSFET resistor circuits, and all virtually grounded capacitors. Third‐order current‐mode Chebychev low‐pass and high‐pass filters are realized to verify the validity of the theoretical analysis. Experimental results employing commercially available current feedback amplifiers are also given. Copyright © 2008 John Wiley & Sons, Ltd.     

Harmonic oscillators realized using current amplifiers and grounded capacitors

New configurations of harmonic oscillators, realized using current amplifier blocks and only grounded capacitors, are introduced in this article. The proposed configurations are based on a grounded inductor simulator scheme and on a loop constructed from first‐order sections, respectively. Comparison with the already published topologies shows that the new configurations have attractive characteristics concerning their implementation in integrated form. Copyright © 2006 John Wiley & Sons, Ltd.     

Modified CFOA,its transpose,and applications

It is shown that the recently‐proposed modified current feedback operational amplifier (MCFOA) is quite a versatile element in that given a realization for a system function using MCFOAs, we can obtain three alternate realizations using the same MCFOA but by appropriately connecting the y, x, w, and z terminals of the MCFOA to the remaining part of the original realization. Using the results concerning the transpose of a multi‐terminal element, it is further shown that the transpose of an MCFOA is another MCFOA. Thus, using the results of transposition, given a voltage‐mode circuit using MCFOAs, we can directly obtain four current‐mode circuits using the same MCFOAs or vice versa. Copyright © 2015 John Wiley & Sons, Ltd.     

电流互感器二次回路断线在差动保护中的应用

对我省使用的差动保护中电流互感器二次回路断线的不同原理作了比较 ,并对电流互感器二次回路断线后是否跳闸进行了探讨。     

Voltage mode and current mode Tow Thomas bi‐quadratic filters using inverting CCII

A voltage mode Tow Thomas bi‐quadratic filter using the inverting second‐generation current conveyor (ICCII) is given. The filter has high input impedance, employs two grounded capacitors, and has independent control on Q, independent control on the band‐pass and low‐pass response gain. Three alternative current mode filters are generated from the voltage mode circuit. The three circuits have zero input impedance, employ grounded capacitors and have independent control on Q. Two of the circuits have also all resistors grounded and the other uses only ICCII?and has only one floating resistor. Copyright © 2007 John Wiley & Sons, Ltd.     

Electronically controlled multiphase sinusoidal oscillators using current amplifiers

A novel current‐mode multiphase oscillator topology is introduced in this letter. This is realized by employing current amplifiers and only grounded capacitors. Attractive characteristics offered by the new topology are the electronic adjustment of the oscillation frequency, the absence of passive resistors, and the requirement of only grounded capacitors. Comparison with the corresponding already published current follower based structure shows that the proposed topology has better performance in terms of the number of required active elements, the employment of passive resistors, and the ability for electronic adjustment of the oscillation frequency. Copyright © 2008 John Wiley & Sons, Ltd.     

一种新型单片反激式开关电源的应用

采用新型单片TDA16831-4设计了一种小型化的反激式开关电源电路,此电源具有结构简单,效率、可靠性高的特点。     

Current‐mode programmable piecewise‐linear neural synapses

Cellular Neural Networks with piecewise linear connection have been proposed by several authors as a generalization of the basic paradigm, which allows for more complex functionality. None of the prototypes realized to date, however, provides for such kind of synapses. As a feasibility study, a current‐mode subthreshold CMOS piecewise‐linear synapse circuit is developed in this paper. Copyright © 2003 John Wiley & Sons, Ltd.