CALIBRATION ALGORITHM FOR CURRENT-OUTPUT R-2R LADDERS

• Abstract:

  The paper presents a new calibration algorithm for current output R-2R ladders. The R-2R ladders are popular because they are easy to realise, but the resistance tolerances limit their linearity properties. However, it is possible to achieve higher linearity with self-calibration techniques. A formerly published algorithm by Cutkosky is available for the so-called Cutkosky R-2R ladders. A similar algorithm can be applied to the current-output ladders, which are widely used as MDAC or DAC. In the paper the Cutkosky divider is shortly discussed, and then a new description is presented as basis of the calibration algorithm. The calibration algorithm is discussed in details, and the error budget is analysed. A simulator was also written to verify the theory.
• Keywords:

  binary voltage dividers, Cutkosky-divider, DA converter, Gauss method, R-2R ladder, self-calibration
• Download:

  IMEKO-WC-2000-TC4-P162.pdf
• DOI:

  _unreg_wc-2000.162

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