Analysis of R-2R digital-to-analog converter with equal current switching
Yeoh, Mei Ling
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https://hdl.handle.net/2142/101643
Description
Title
Analysis of R-2R digital-to-analog converter with equal current switching
Author(s)
Yeoh, Mei Ling
Issue Date
2018-05-21
Director of Research (if dissertation) or Advisor (if thesis)
Radhakrishnan, Chandrasekhar
Hanumolu, Pavan K.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
R-2R, DAC, INL, DNL
Abstract
Analysis and performance tradeoffs of an R-2R digital-to-analog converter with equal current switching are presented. It is shown that for such architecture, the active area of the DAC grows as the resolution increases due to higher matching requirement needed. A fully binary-weighted DAC suffers from well-known differential linearity problems and large switching glitches at the output, while a fully thermometer-coded DAC benefits from the relaxed DNL but requires a large area to realize. The R-2R DAC with equal current switching into the ladder network can be implemented using very low currents with more relaxed current matching requirements over the binary-weighted DAC, and less area over the thermometer-coded DAC.
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