摘要
校准系统是实现高精度高速度流水线ADC的关键技术之一.论文对流水线ADC结构进行描述,对误差来源进行分析,并且对通过计算每级转换函数跳变点高度来得到权重的校准算法进行研究,最后提出校准算法实现方案,进行实现并且给出实现结果与版图.实现结果表明:完成校准系统只需要一些纯粹的数字电路,实现简单.同时,算法仿真结果表明,这种算法可以满足高精度ADC的要求,是一种实现性、可靠性好的校准算法实现方法.
Calibration is a crucial technique for the implementation of high-speed and high resolution analog-to-digital converters. This paper describes the structure of a pipelined ADC, analyzes the sources of errors in the pipelined ADC, focuses on a calibration algorithm that gains the weights by calculating the height of the jumping point of the transition function,presents its implementation scheme, and gives the implementation results and layout of the calibration system. Implementation the calibration system is simple and requires only pure digital circuits. Meanwhile, the simulation of this algorithm shows that it meets the requirements of high-resolution ADCs, and, with respect to availability and reliability,it is a well implemented scheme.
关键词
数字校准
数字冗余
电容失配
失调
digital calibration
digital redundancy
capacitor mismatch
offset
