Abstract:  In order to achieve higher DAC(Digital-to-Analog Converter) resolution, a general structure of voltage
output DAC which is suitable for arbitrary radix is proposed. The general structure of the DAC mainly includes a
resistor network, a set of single-pole multi-throw analog switches, a set of reference voltage sources and a buffer
amplifier. On the basis of the proposed circuit structure, an 8-trit ternary DAC circuit module is designed using
discrete components and integrated circuit chips, and the test data is analyzed for errors. After theoretical
analysis, compared with the traditional DAC, the 8-trit ternary DAC has a resolution increase of 25. 6 times
without significantly increasing the complexity of the structure. And the DAC structure also has the characteristics
of simple structure and strong expansibility on radix and number of digits.

Key words: digital-to-analog converter,     resolution;    , resistance network;    , arbitrary radix