Error of the R-2R code-to-voltage converter with a reference voltage source

Conclusions

• 1. In evaluating the errors of decoders it is necessary to take into account the effect of the deviation of resistances from their nominal values not only on the value of the node voltages, but also on the transfer factors of these voltages to the decoder output.

• 2. The value of δR on the error in setting node voltages and transfer factors had different signs and, therefore, is partially compensated, with the error of node voltages being larger and depending on the distribution of the resistance deviations from their nominal values.

• 3. The effect of residual parameters of the switch is equivalent to the effect of δE and δR, with the effect of σR on the transfer factor being larger. The error due to the residual parameters of the switch has a constant sign.

• 4. With an appropriate selection of the signs of resistance deviations from their nominal value it is possible to obtain a partial compensation of the errors δR and σR.

• 5. The required number of decoder locations can be determined from (24) or (26).