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Several forms of digital-to-analog conversion circuit

elecfans | 30/06/2021

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.

1, weight resistance type DAC:

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.

2, T-type resistance DAC

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.

3, inverted T-resistance DAC

Inverted T-type DAC also has only two resistance values, R and 2R, which is relatively easy to implement.


4, weight current DAC

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.

5, right capacitive DAC

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.

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