JSSC 2012第12期Data Converters90nmVCO

A 16-mW 78-dB SNDR 10-MHz BW CT ADC Using Residue-Cancelling VCO-Based Quantizer

本文提出了一种采用VCO内部量化器的连续时间调制器，通过两级残差消除量化器实现高效噪声整形。

90nm CMOS, 16mW, 78.3dB SNDR, 10MHz BW, 600MHz时钟

连续时间调制器VCO量化器残差消除噪声整形CMOS

▸使用VCO作为两级残差消除量化器的第二级

▸通过限制VCO的非线性区域减少非线性影响

▸在连续时间环路中实现二阶噪声整形

Abstract

This paper presents a continuous-time (CT) modulator using a VCO-based inte rnal quantizer. It incorporates a nonlinear VCO as the second stage in a two-stage residue canceling quantizer (RCQ) and mitigates the impact of its non- linearity by spanning only a small region of the VCO’s V-to-F nonlinear tuning curve. The order of noise shaping is increased by placing the RCQ in a continuous-time loop. Using only a ﬁrst order loop ﬁlter, the proposed modulator achieves second order noise shaping. Fa