A High Quality Controlled Current Source

1 June 1979

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Instrumentation and Measurement

Vol. 28 (2) , 132-140
https://doi.org/10.1109/tim.1979.4314781

Abstract

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 gain-bandwidth product forty times larger than the gain-bandwidth product of the operational amplifier used. Detailed experimental results are included to verify predicted frequency response and gain characteristics.

Keywords

This publication has 10 references indexed in Scilit:

True noninverting integrators with single grounded capacitor
Proceedings of the IEEE, 1978
Monolithic nullor-a universal active network element
IEEE Journal of Solid-State Circuits, 1977
A Novel Null Detector Circuit
IEEE Transactions on Instrumentation and Measurement, 1977
Active RC bandpass and lowpass filters using the d.v.c.c.s./d.v.c.v.s.
Electronics Letters, 1976
Design of differential-voltage-controlled current source
Proceedings of the Institution of Electrical Engineers, 1976
An accurate integrated voltage-to-current converter
IEEE Journal of Solid-State Circuits, 1975
Computer analysis of nullor networks
Electronics Letters, 1973
Generation of all finite linear circuits using the integrated DVCCS
IEEE Transactions on Circuit Theory, 1971
On Nullators and Norators
IEEE Transactions on Circuit Theory, 1966
Network Synthesis with Negative Resistors
Proceedings of the IRE, 1961