• DocumentCode
    1478348
  • Title

    A Precision Current Source Using \\Delta – \\Sigma Modulation

  • Author

    Bergsten, Tobias ; Rydler, Karl-Erik ; Gunnarsson, Ove ; Eklund, Gunnar ; Tarasso, Valter

  • Author_Institution
    SP Tech. Res. Inst. of Sweden, Boras, Sweden
  • Volume
    60
  • Issue
    7
  • fYear
    2011
  • fDate
    7/1/2011 12:00:00 AM
  • Firstpage
    2341
  • Lastpage
    2346
  • Abstract
    We present a new source for currents in the picoampere range based on the charging of a capacitor at a constant rate. The voltage ramp is generated using Delta-Sigma modulation and low-pass filtering. This method ensures the linearity of the voltage ramp by calibrating a small number of voltage levels prior to generating the current. Our analysis shows that we can calibrate a picoampere meter with a standard uncertainty of less than 20 μA/A at 10 pA.
  • Keywords
    capacitors; constant current sources; delta-sigma modulation; low-pass filters; Δ-Σ modulation; capacitor; delta-sigma modulation; low-pass filtering; picoampere range current source; precision current source; standard uncertainty; Calibration; Capacitors; Current measurement; Modulation; Noise; Uncertainty; Voltage measurement; Calibration; capacitance; current measurement; sigma-delta modulation; uncertainty;
  • fLanguage
    English
  • Journal_Title
    Instrumentation and Measurement, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0018-9456
  • Type

    jour

  • DOI
    10.1109/TIM.2011.2117250
  • Filename
    5737787
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1478348