A general introduction on digital - analog converter study of domestic and aboard is presented . dac principle and structures , and different converters such as current converting and voltage converting are analized . a 8 - bit high speed dac is designed . based on the study of binary weighted dac and thermometer - coded dac , a thermometer - coded current - steering dac is adopted 通過閱讀大量文獻,較為全面地概括了數模轉換器( dac )的國內外動態,介紹了dac的基本原理和結構,分析了dac主要誤差來源和模型,對幾種典型的dac結構進行了詳細的分析,并設計出一個8位高速dac 。