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R-2R ladder tolerances?

Discussion in 'Electronic Basics' started by Rich Grise, Sep 3, 2004.

  1. Rich Grise

    Rich Grise Guest

    From time to time I think about building an R-2R ladder and drive
    it with some HCMOS buffer chip, and was wondering about resistor
    tolerances. It seems like the cumulative error using 1% resistors
    would max out at about 2%, wouldn't it? And even if you used wide-
    tolerance resistors, say, 10% or even 20% (there used to be such
    things) yes, it could be all over the map, but would it still
    be monotonic? The error of each lower bit is halved (isn't it?),
    so even if one is +20% and the rest are -20%, - hmm. Can anybody
    do this in their head? Would the transition from 01111111 to 10000000
    go upside-down?

    Just wondering...

    Thanks!
    Rich
     
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