一种电流型10位D/A转换器的设计

A 10bit CurrentMode DigitaltoAnalog Converter

介绍了一种电流型１０位Ｄ／Ａ转换器的设计。着重阐述了差分式电流开关，Ｒ－２Ｒ梯形电阻、二进制电流加权网络和精密基准源的设计原理和结构。该Ｄ／Ａ转换器采用线性兼容Ｉ２Ｌ工艺制作，具有体积小、功耗低、可靠性高、使用方便灵活等特点。线性误差、微分线性误差均低于１／２ＬＳＢ，建立时间２００ｎｓ，在－１５Ｖ电源下功耗低于６０ｍＷ。

A 10bit currentmode D/A converter has been developed using linear compatible I2L process. The differential current switch, R2R resistor ladder network, binary currentweighted network and the precision reference source are described in terms of their design principles and circuit structures. Both the linear error and differential linear error for the converter are less than 1/2 LSB. It has achieved a settling time less than 200 ns and power dissipation lower than 60 mW at 15 V power supply.