Digital-to-analog converter is a device that converts digital quantities into analog quantities. Generally, resistor networks, operational amplifiers, reference power supplies and analog switches are required in the circuit, and there are multiple circuit structures.
Weighted resistance digital-to-analog converters use a weighted resistance network, where the resistance value is 2 to the 0th power, 1st power, 2nd power, 3rd power, etc.
Because it is difficult for resistors to obtain n-th power resistance values with sufficient accuracy, the weighted resistor network is more difficult to use in practice, while T-type resistors have only two resistance values, R and 2R, which are easier to obtain.
Inverted T-type DAC also has only two resistance values, R and 2R, which is relatively easy to implement.
Weighted current DAC uses a current source organized according to the n-th power of 2, which is a form that can be implemented in integrated circuits.
Right capacitive DAC is also a form that can be implemented in integrated circuits. There are other forms of DAC circuits, such as the double-capacitor type, which are mainly used in integrated circuits.