题目/Title：A Digital Background Calibration Algorithm Based on Code Occurrence Count for Pipelined ADCs

作者/Author：李玮韬,李福乐,张春,王志华
                        Weitao Li,Fule Li,Chun Zhang,Zhihua Wang

会议/Conference：ICCCAS 2009

地点/Location：Milpitas, CA

年份/Issue Date：2009.23-25 July

页码/pages：pp. 550 - 553

摘要/Abstract：
This paper proposes a digital background calibration algorithm for pipelined analog-to-digital converters (ADCs). The algorithm doesn’t modify pipeline stages and only needs simple calibration logic. Based on the analysis of the output codes, the algorithm estimates the bit weight of each stage and calculates the outputs. To verify the algorithm, a 13-bit pipelined ADC with 1.5-bit/stage architecture is simulated with nonideal factors such as random capacitor mismatch, comparator offset, finite opamp gain, opamp noise and opamp offset taken into account. SNDR is improved from 43.9dB to 76.5dB. Monte Carlo simulation result demonstrates the algorithm is robust to random circuit parameters.