一种高精度低成本10位D/A转换器的设计与实现

Design and Implementation of a High-Precision and Low-Cost 10-Bit Digital-to-Analog Converter

设计了一个采用UMC 0.35μm工艺的高精度、低成本10位D/A转换器电路。该电路对电阻匹配系数要求与7位D/A转换器相同,在相同精度要求下有效减小了版图面积,降低了设计难度和生产成本。最后,在版图上采用新颖的排列方式,进一步减小了温度等因素的影响。该D/A转换器的DNL为-0.2^+0.2,INL为-0.6^+0.6。设计的电路模块已成功应用于商用驱动芯片。

A high-precision and low-cost 10-bit D/A converter was designed and implemented using 0.35 μm process technology.In this circuit,requirement for matching coefficient of resistance is the same as that for a 7-bit DAC,which means that,with same process technology,layout area of the proposed circuit could be greatly reduced,hence lower cost and easier design.Finally,temperature effect on layout was further reduced by using a novel layout placement.Test results showed that the proposed D/A converter had a DNL range from-0.2 to ＋0.2 and an INL range from-0.6 to ＋0.6.The circuit has been successfully used in commercial motor chips.