# A low noise modular current source for stable magnetic field control

## TL;DR

This paper presents a modular, low-noise, and stable unipolar current source design that is cost-effective, easily scalable, and suitable for controlling multiple DC sources simultaneously in magnetic field applications.

## Contribution

It introduces a hybrid switching/linear circuit design that enhances stability, reduces power dissipation, and allows for flexible, programmable current control in a modular setup.

## Key findings

- Improved stability and reduced noise in current sources.
- Cost-effective design suitable for multiple units.
- Flexible control with digital-to-analogue conversion.

## Abstract

A low cost, stable, programmable, unipolar current source is described. The circuit is designed in view of a modular arrangement, suitable for applications where several DC sources must be controlled at once. A hybrid switching/linear design helps in improving the stability and in reducing the power dissipation and cross-talking. Multiple units can be supplied by a single DC power supply, while allowing for a variety of maximal current values and compliance voltages at the outputs. The circuit is analogically controlled by an unipolar voltage, enabling current programmability and control through commercial digital-to-analogue conversion cards.