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Published on: August 15, 2014
A low noise modular current source for stable magnetic field control
Valerio Biancalana1, Giuseppe Bevilacqua1, Piero Chessa1
1DIISM University of Siena, CNISM, Via Roma, 56, 53100 Siena, Italy.
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 a unipolar voltage, enabling current programmability and control through commercial digital-to-analogue conversion cards.
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