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A 745-dB Dynamic Range 10-MHz BW CT- ADC With Distributed-Input VCO and Embedde
本文介绍了一种采用分布式输入VCO作为第二级积分器和量化器的二阶VCO基连续时间ΔΣ调制器，显著提高了动态范围和能效。
40nm CMOS, 655 MS/s, 74.5-dB动态范围, 10-MHz带宽
VCO基ΔΣ调制器分布式输入VCO电容π网络动态范围能效优化
▸分布式输入VCO拓扑消除V-F寄生极点
▸电容π网络打破调制器内DAC尺寸与前端Gm-C积分器阻抗缩放因子的约束
▸无需DAC校准或显式动态元件匹配电路
Abstract
This work introduces a second-order voltage-
controlled oscillator (VCO)-based continuous-time delta–sigma
modulator (CTDSM) that incorporates a distributed-input
VCO as the second-stage integrator and quantizer. The
distributed-input VCO topology virtually eliminates the VCO’s
voltage-to-frequency (V-F) parasitic pole. One of the key ideas of
this article is to demonstrate the use of a capacitive- π network
in the modulator’s loop filter to break the constraint between
the size of the modulator’