Title :
Calibration algorithm for current-output R-2R ladders
Author :
Vargha, Balázs ; Zoltan, I.
Author_Institution :
Dept. of Meas. & Inf. Syst., Budapest Univ. of Technol. & Econ., Hungary
Abstract :
The paper presents a new calibration algorithm for current-output R-2R ladders. The widely used R-2R ladders are easy to realise as an integrated circuit, but the resistance tolerances limit their linearity properties. However, it is possible to achieve higher linearity with self-calibration techniques. A formerly published calibration 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 of the inverse ladder is presented as a 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 :
calibration; digital-analogue conversion; error analysis; ladder networks; network analysis; voltage dividers; Cutkosky R-2R ladders; Cutkosky divider; Gauss method; MDAC; binary voltage divider; calibration algorithm; current-output R-2R ladders; current-output ladders; error budget; integrated circuit; inverse ladder; resistance tolerances; self-calibration; simulator; Calibration; Current measurement; Gaussian processes; Information systems; Linearity; Paper technology; Resistors; Switching circuits; Voltage; World Wide Web;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2000. IMTC 2000. Proceedings of the 17th IEEE
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-5890-2
DOI :
10.1109/IMTC.2000.848836
