D/A converter street effect compensation

摘要

A digital-to-analog converter (DAC) employs a main DAC resistor string and a sub-resistor string formed in a semiconductor material. A main DAC conversion circuit is formed with a headroom resistor in series with the main DAC resistor string. The headroom resistor provides an operating voltage for current drivers in the sub-resistor string. The headroom resistor is formed adjacent to the main DAC resistor string in the semiconductor material to provide street effect compensation thereto. In practice, the main DAC resistor string is formed as two sets of resistor strings. The headroom resistor is formed as a first resistor string adjacent one main DAC resistor string set, and as a second resistor string adjacent the other main DAC resistor string set. The plural resistors of the headroom resistor strings have resistor values equal to the plural resistors of the respective main DAC resistor string sets.