摘要
基于运算放大器(OTA)的开关电容技术是目前流水线模数转换器(ADC)的主要实现方式。由于该技术需要使用高增益宽带宽OTA来保证电路的速度和精度,基于该技术的流水线ADC难以在纳米级CMOS工艺条件下实现并且功耗限制日益突出。文章首先介绍了流水线ADC的基本原理,其次介绍了基于OTA的开关电容实现技术及其在纳米级CMOS工艺条件下实现的主要限制,最后介绍了因国际上针对基于OTA的开关电容实现技术的限制所提出的一些最新研究进展。
Most Pipelined ADCs today are realized in the op-amp based switched-capacitor circuits.The op-amp based switched-capacitor circuits need OTA with high gain and wide bandwidth to ensure its speed and precision.The implementation difficulty in nanometer CMOS technology and power consumption are the key bottleneck for Pipelined ADC using op-amp based switched-capacitor circuits.The basic principle of Pipelined ADC is introduced.The implementation of op-amp based switched-capacitor circuits and the realization difficulty in nanometer CMOS technology are also introduced.The latest development in Pipelined ADC that overcome the bottleneck of op-amp based switched-capacitor circuits is discussed in the last.
出处
《电子与封装》
2011年第1期13-17,共5页
Electronics & Packaging
关键词
模数转换器
流水线
开关电容
比较器
analog to digital converter
pipeline
switched capacitor
comparator