用于威尔金森A/D转换器的高速高精度比较器  

High-Speed and High-Resolution Comparator for Wilkinson A/D Converter

作　　者：王莉[1] 高武[1] 高德远[1] 魏廷存[1] 胡永才[1] 

机构地区：[1]西北工业大学计算机学院,西安710072

出　　处：《微电子学》2013年第2期174-178,共5页Microelectronics

基　　金：国家自然科学基金资助项目(60972157;61101190);国家重大科学仪器专项资助项目(2011YQ040082)

摘　　要：提出了一种用于威尔金森(Wilkinson)A/D转换器(ADC)的高速高精度比较器的设计方法。该比较器由三级预放大器和一级输出放大器组成,采用开环结构和多级级联的形式,以满足增益和速度的要求。为了消除失调电压对电路的影响,采用输出失调消除技术进行失调电压校正。采用3.3VTSMC 0.18μm CMOS工艺完成电路设计。Spectre仿真结果表明,在1MHz最高采样频率下,该比较器的分辨率达到0.4mV,传输延迟小于20ns,满足12位Wilkinson ADC的要求。A high-speed and high-resolution CMOS comparator for Wilkinson A/D converter was designed.The comparator was comprised of three preamplifiers and one output stage realized by a current operational amplifier.An open-loop architecture was adopted for the comparator,and multiple stages were cascaded to achieve the desired gain and speed.Output offset storage was adopted to cancel offset voltage of the amplifier.The circuit was designed based on 3.3-V TSMC 0.18 μm CMOS process.Results from Spectre simulation showed that the proposed comparator had a resolution of 0.4 mV at a maximum sampling frequency of 1 MHz,and a propagation delay less than 20 ns,which satisfied the requirements of 12-bit Wilkinson A/D convertor.

关 键 词：比较器 A D转换器 输入失调电压消除 

分 类 号：TN432[电子电信—微电子学与固体电子学]