Extending voltage-mode op amps to current-mode performance
Extending voltage-mode op amps to current-mode performance
复制标题
将电压模式运算放大器扩展到电流模式性能
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
C. A. Makris
中科院分区：
文献类型：
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作者：
C. Toumazou;F. J. Lidgey;C. A. Makris
本文综述了用于扩展传统电压模式运算放大器的输出能力以实现电流模式性能的技术。跟踪过去二十年的发展，一些优雅的和有用的电路拓扑结构，实现放大器的电流输出特性的控制。特别是，运算放大器电源电流检测技术及其应用程序的电流跟随器和电流输送器电路的实现进行检查。在此基础上，介绍了基于电流模式放大器的高性能跟随器放大器、双二次滤波器、精密全波整流器和基于电压运算放大器的仪表放大器的设计。集成电路实现的一个七端运算放大器，允许直接访问运算放大器的输出电流通过其推挽输出级。集成七端运算放大器的CMOS工艺实现和实验结果。最后，电流反馈，高精度，电流增益单元的描述，克服了电源电流检测技术存在的几个缺点。
This paper reviews techniques for extending the output cababilities of conventional voltage-mode operational amplifiers to achieve current-mode performance. Tracing the development over the past two decades, a number of elegant and useful circuit topologies for realising amplifiers with controlled current output properties are described. In particular, the operational amplifier supply current sensing technique and its application to current follower and current conveyor circuit implementations is examined. The authors then review their work, based on enhancing the performance of conventional voltage-mode amplifier designs by application of these currentmode alternatives.A high performance follower based amplifier, a biquadratic filter section, a precision full-wave rectifier and an instrumentation amplifier based upon enhancement to the voltage operational amplifier are shown to outperform their conventional counterparts. The integrated circuit realisation of a seven terminal operational amplifier that allows direct access to the operational amplifier output current via its push-pull output stage is then presented. The integrated seven terminal operational amplifier is realised in CMOS technology and experimental results presented. Finally a current feedback, high precision, current gain cell is described that overcomes several of the drawbacks that exist with the supply current sensing technique.