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本文介绍一种适用于低频仪器设备的精密可控电压式电流源。其电路具有良好的温度稳定性,其传输系数主要取决于网络电阻的比率。近年来,许多作者曾经介绍过许多使用集成电路或分立元件组成的可控电流源(CCS)(见参考文献1—3),其中大部分电路都是依赖于准确的整机增益以保证电流准确传输至输出端。而本文所介绍的电路要点足根据精密程度的需要,通过负反馈来克服与此有关的一些问题。
This article describes a precision controllable voltage current source suitable for low frequency instrumentation. The circuit has a good temperature stability, the transmission coefficient depends mainly on the ratio of network resistance. In recent years, many authors have introduced many controllable current sources (CCSs) using integrated circuits or discrete components (see References 1-3), most of which rely on accurate machine gain to ensure accurate current Transfer to output. The circuit described in this article enough to meet the needs of the degree of precision through negative feedback to overcome some of the issues related to this.