HIGH-QUALITY CONTROLLED CURRENT SOURCE

被引：25

作者：

HASLETT, JW

RAO, MKN

机构：

[1] Department of Electrical Engineering, University of Calgary

来源：

IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT | 1979年 / 28卷 / 02期

关键词：

D O I：

10.1109/TIM.1979.4314781

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A technique for realizing a high-quality controlled current source is described. A monolithic operational amplifier is used as the main building block, and a modified current mirror is used to recover the signal current from the power supply leads of the amplifier. The proposed mirror exhibits low input resistance, which reduces errors due to the noninfinite power-supply rejection characteristics of the amplifier, and a current-splitting network allows the realization of output impedances in the range of tens of megohms using standard components. The entire circuit operates in a class-AB mode for high drive capability with low values of quiescent current. A simple application is included to show that a voltage amplifier can readily be constructed which exhibits a 3-dB gainbandwidth product forty times larger than the gainbandwidth product of the operational amplifier used. Detailed experimental results are included to verify predicted frequency response and gain characteristics. Copyright © 1979 by The Institute of Electrical and Electronics Engineers, Inc.

引用

页码：132 / 140

页数：9

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