基准电压波动对Σ-Δ A/D转换性能的影响  

Effects of Reference Voltage Variation on Σ-Δ A/D Conversion

作　　者：孔晓彬[1] 胡海波[1] 吴明远[1] 张明[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《微电子学》2005年第4期340-343,348,共5页Microelectronics

摘　　要：Σ-ΔA/D转换器需要一个基准电压作为参照进行模/数转换,因此,基准电压上的任何变化都会直接影响到A/D转换的结果。文章推导分析了基准电压的DC及AC波动对Σ-ΔA/D转换结果的影响机制,并用一个三阶Σ-ΔA/D转换器实例,在Matlab仿真环境中验证了分析结果。文章的结论可用于指导Σ-ΔA/D转换器芯片中带隙基准源模块的电源抑制比设计。In ∑-△A/D converter, analog to digital conversion is carried out by comparing the input signal to a reference voltage. Therefore,any variations of the reference voltage will affect the results of the A/D conversion. In this paper, effects and mechanisms in DC and AC variations are analyzed, respectively. A third-order ∑-△ A/D converter model is built in Matlab and the results obtained are verified.

关 键 词：A/D转换器 过采样 带隙基准源 电源抑制比 

分 类 号：TN792[电子电信—电路与系统]