题目/Title：An 11-bit 200MS/s Subrange SAR ADC with Charge-Compensation-Based Reference Buffer

作者/Author：魏舒舒,何秀菊,李福乐,王志华
                        Shushu Wei,XiuJu He,Fule Li,Zhihua Wang

会议/Conference：NEWCAS 2016

地点/Location：Vancouver, Canada

年份/Issue Date：2016.26-29 Jun.

页码/pages：pp. 1 - 4

摘要/Abstract：
This paper presents an 11-bit 200MS/s subrange SAR ADC with charge-compensation-based (CCB) reference buffer. The precision, stability and noise of reference voltage are critical to the performance of ADC. Charge is released to or absorbed from reference during data conversion, resulting in fluctuation of reference voltage. Conventionally a large on-chip decoupling capacitor is required to stabilize reference voltage. In this paper, charge losing of reference for a subrange SAR ADC is analyzed, and a charge-compensation-based reference buffer is designed to reduce decoupling capacitor size. The implemented ADC was measured with the charge compensation circuit disabled and enabled, respectively. Measurement results show obvious improvement on SFDR and SNDR with reference charge-compensated