Abstract: Circuitry is disclosed herein that dynamically (temperature-invariant and voltage-invariant) adjusts the Ron of switches in a resistive Nyquist-rate digital to analog converter (DAC) to thereby reduce DAC nonlinearity errors and improve INL results of greater than 16b. Consistent with the present disclosure, the DAC includes an R-2R ladder in which each bit corresponds to a switch. A control circuit is provided for generating signals applied to the gate of the switch to cause the on-resistances of the switch to be a particular value, such that the on-resistance of the switch plus the sum of two resistors, one having the resistance R, and the other having a resistance R? is equivalent to the resistance of the 2R-size resistors or twice the resistance of the R-sized resistors in the ladder.