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Offset-voltage compensation for accurate current-source circuit

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4 Author(s)
K. Jang ; University of Seoul, Seoul, Republic of Korea ; S. Lee ; J. Lee ; J. Choi

The offset-voltage compensation technique is proposed for an accurate current-source circuit. This current source is made of a transistor, a resistor, and operational amplifier feedback in order to achieve a high output resistance as well as high accuracy of a generated current signal. Discrepancy from the ideal value mainly results from the offset voltage of the operational amplifier. The transconductance amplifier is utilised with a feedback loop that is controlled by the switched-capacitor integrator. The proposed technique is incorporated in the light-emitting diode driver circuit applications and successfully verified with hardware measurement.

Published in:

Electronics Letters  (Volume:48 ,  Issue: 15 )