Abstract: A digital-to-analog converter (i.e., D/A converter) formed on a wafer comprises a decoder, transistors (e.g., field-effect transistors) and resistors. Since the wafer provides a gap between the p-well region and the n-well region, the resistance values of the resistors formed on the p-well region differ from those of the resistors formed on the n-well region. In order to cancel such difference between the resistance values, there are provided two series of resistors in parallel between a power-applying terminal and a ground terminal, wherein each of two series of resistors contain two kinds of resistors respectively formed on the p-well region and the n-well region, while a midpoint of the first series of resistors is connected with a midpoint of the second series of resistors. Due to the direct connection between two midpoints, the potential applied to these midpoints are stabilized and set at the certain fixed voltage.