题目/Title：A low-offset dynamic comparator with input offset-cancellation

作者/Author：裴蕊寒,刘佳,唐仙,李福乐,王志华
                        Ruihan Pei, Jia Liu,Xian Tang,Fule Li,Zhihua Wang

会议/Conference：ASICON 2017

地点/Location：Guiyang, China

年份/Issue Date：2017.25-28 Oct.

页码/pages：pp. 132 - 135

摘要/Abstract：
This paper presents a low-offset dynamic comparator using an input offset-cancellation technique. The offset of a dynamic comparator is mainly determined by the dynamic preamplifier. The proposed technique achieves input offset-cancellation under the assistance of the dynamic preamplifier and input-series capacitors, without quiescent current. The offset resulting from both threshold voltage mismatch and sizing factor mismatch can be cancelled. A prototype comparator is implemented by 65-nm CMOS technology with an area of 127µm2. The simulation results show it achieves 1.16-mV offset at 1-sigma(σ), while its counterpart without offset-cancellation achieves 8.91-mV offset at 1-sigma(σ). After post-layout simulation, the offset at 1-sigma(σ) only slightly increases to 1.56-mV. The power dissipation is 135-µW from a 1.2V supply, at 500MHz operating.