由权电阻链接成的权电压式DAC

A Weight Voltage DAC been Chained by Weight Resistance

文章提出了一种由权电阻链接成的权电压式DAC,一个n位的DAC由n个权电阻(20r,21r,22 r,…,2n-1r)构成电阻链跨接于电源正负极,任何一个权电阻都可以根据数字信号的控制,链接到输出结点以上或以下,从而使输出电压为对应于数字信号的权电压组合,实现权电压式数模转换。权电压DAC有以下特征:摒弃传统的权电流原理,采用权电压原理;与权电流式DAC相比,其电流最大值下降两个数量级;其转换精度仅取决于电阻值的精度,转换精度更容易提高。

This article brings forward a kind of Weight Voltage DAC which is been chained by Weight Resistances, a n bits DAC is based on n Weight Resistances （2^0r,2^1r,2^2r,…,2^n-1r） which formed a resistance-chain and crossed connecting to anode and cathode of the power source, whichever Weight Resistance could be linked up or down output point according to the controlling digital signals, thus makes the output voltage becoming Weight Voltage combination corresponded to digital signal, achieving a Weight Voltage Digital-Analog Convert （DAC）. Weight Voltage DAC, its conversion precision only depends on the precision of resistance. Such DAC has following characters： abandon the traditional Weight Current principle by adopting the Weight Voltage principle; compared with Weight Current DAC, its maximum current streaming drops two orders of magnitude; More likely to improve the precision of conversion.