Offset-voltage compensation for accurate current-source circuit

K. Jang, S. Lee, J. Lee, J. Choi

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Pages (from-to)913-914
Number of pages2
JournalElectronics Letters
Issue number15
StatePublished - 17 Jul 2012


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