JSSC 2020第3期Data Converters40nmSAR ADC

A 10-bit 120-MS-s SAR ADC With Reference Ripple Cancellation Technique

提出一种参考电压纹波消除技术，用于高速SAR ADC，通过反向耦合路径抵消纹波影响。

10-bit, 120-MS/s, 55 dB SNDR, 3-pF decoupling capacitor

SAR ADC参考电压纹波高速转换纹波消除CMOS

▸提出参考电压纹波消除技术，通过反向耦合路径抵消纹波

▸采用全尺寸参考纹波耦合到比较器，但极性相反

▸显著提升SNDR并降低INL/DNL

Abstract

This article presents a reference ripple cancella- tion technique for high-speed successive approximation regis- ter analog-to-digital converters (SAR ADCs) to address the reference voltage settling issue. Unlike prior techniques that aim to minimize the reference ripple, this article proposes a new perspective: it provides an extra path for the full-sized reference ripple to couple to the comparator but with an opposite polarity, so that the effect of the reference ripple is canceled out, thus