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Offset-voltage compensation for accurate current-source circuit

Offset-voltage compensation for accurate current-source circuit

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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.

Inspec keywords: light emitting diodes; feedback amplifiers; resistors; driver circuits; switched capacitor networks; constant current sources; operational amplifiers; transistors

Other keywords: light-emitting diode driver circuit application; hardware measurement; operational amplifier feedback; resistor; transconductance amplifier; feedback loop; transistor; offset-voltage compensation technique; output resistance; switched-capacitor integrator; current-source circuit; current signal generation

Subjects: Resistors; Amplifiers; Semiconductor devices; Power electronics, supply and supervisory circuits; Light emitting diodes; Time varying and switched networks

References

    1. 1)
    2. 2)
      • van der Broeck, H., Sauerländer, G., Wendt, M.: `Power driver topologies and control schemes for LEDs', Applied Power Electronics Conf., February 2007, Anaheim, CA, USA, p. 1319–1325.
    3. 3)
      • Hsieh, C.-Y., Wei, Y.-S., Chen, K.-H., Lin, T.-C.: `Efficient LED driver with an adaptive reference tracking technique', Int. Conf. on Electronics Circuits and Systems, 2009, Yasmine, Hammamet, Tunisia, p. 291–294.
    4. 4)
      • Hu, Y., Jovanović, M.M.: `A novel LED driver with adaptive drive voltage', Applied Power Electronics Conf. and Exposition, February 2008, Austin, TX, USA, p. 565–571.
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