| 摘要 |
In described examples, a digital-to-analog conversion (DAC) circuit (100) has a resistor ladder circuit (130) controlled by high order bits (D[n+l :N]) and a resistor string circuit (110) controlled by low order bits (D[l :n]). The resistor ladder circuit (130) includes a stem resistor (131) and a branch resistor (132). The stem resistor (131) has a stem resistance, and the branch resistor (132) has a branch resistance that is substantially equal to two times of the stem resistance. The resistor string circuit (110) includes a string current source (120), a string resistor (114), and a bridge resistor (117). The string current source (120) is configured to generate a string current that is based on a ratio of a reference voltage divided by a predetermined resistance. The string resistor (114) has a string resistance that corresponds to the predetermined resistance, and it is configured to selectively receive the string current based on a selection signal (143) decoded from the low order bits (D[l :n]). |
