一种通用高速高精度数字/模拟转换器

A Universal High Speed, High Precision Digital to Analog Converter

介绍了一种通用高速高精度数字／模拟转换器（ＤＡＣ）的电路原理。着重阐述了内部基准源、权电流发生网络和电流开关的设计原理及电路结构。该ＤＡＣ采用高压－浅结双极工艺和激光修调薄膜电阻技术制作，具有１２位的高分辨率，小于１／２ＬＳＢ的积分线性误差和微分线性误差的高精度，小于２５０ｎｓ稳定时间的高速度，以及灵活的外接方式。±１５Ｖ电源工作条件下，功耗仅２２５ｍＷ，可应用于多种场合。

A universal high speed, high precision digital to analog converter (DAC) is presented. The design theory of the internal reference source, the weighted current generation network and the current switch in the DAC and their circuit structure are dealt with in particular. Fabricated with high voltage, shallow junction bipolar process and laser trimming of thin film resistors, the device has achieved a 12 bit resolution, an integrator linear error and a differential linear error less than 1/2 LSB. Operating at a ±15 V power supply, it has a power dissipation down to 225 mW.