多值D/A转换器分流电阻网络研究

Study on Resistor Network Dividing Current of Multiple Valued D/A Converter

本文通过对Ｄ／Ａ转换数学表示的分析，用电流分流方法解释了二值Ｄ／Ａ转换器使用电阻网络的物理实现，并在此基础上提出了三值Ｄ／Ａ转换器分流电阻网络。该Ｄ／Ａ转换器仅用一个标准参考电源，不论开关处在何种状态，电源的负载均不变，从而提高了Ｄ／Ａ转换器的精度。该设计为多值数字信号直接转换成模拟信号提供了手段。本文还提出了对称三值的Ｄ／Ａ转换器分流电阻网络。

This paper analyses the mathematical expression of a Digital-to-Analog Conversion and explains the physical realization of a two-valued DAC by dividing current. Based on it, the resistor network of a three-valued DAC is proposed. This DAC use only one standard reference voltage, and its load does not change at any states of electronic analog switches, thus the conversion precision is raised.This design provides a new resort by which a multiple-valued digital signal can be directly transformed into analog signal. Finally, this paper also proposed a resistor network dividing current for the symmetric three-valued DAC.