A High Precision Delta-sigma A / D Converter's Design

This paper is finished based upon a part of the project ,which is the design of Delta-Sigma ADC in a high precision electrical meter chip .I introduce the basic theory of Delta-Sigma ADC in detail and bring forward a way to design 18 bits Delta-Sigma ADC which is successfully used in the project, at the first time the paper introduce the the basic theory of Delta-Sigma ADC and two typical decimation FIR digital filters. Subsequently it discuss the new research about Delta-Sigma ADC technology.finally it give detailed process of design a 18 bits single-loop Delta-Sigma ADC and give the whole project a concise introduce.