JSSC 2022第12期Data Converters0.18μmDelta-Sigma ADC

A V ersatile 25-A Shunt-Based Current Sensor With 025 Gain Error From 40 Ct o8

一款基于分流电阻的电流传感器，具有0.25%的增益误差，适用于电池管理应用。

0.18μm CMOS, 1.8V, ±25A, ±0.25%增益误差, 265μA功耗

电流传感器分流电阻delta-sigma ADC温度补偿电池管理

▸采用二阶delta-sigma ADC实现高精度电流检测

▸通过温度系数调谐补偿分流电阻的温度漂移

▸利用自加热效应优化增益平坦度

Abstract

This article presents a versatile shunt-based current sensor for battery management applications. It digitizes the current-induced voltage drop across an external shunt resistor with the help of a 2 nd-order delta-sigma ( ) ADC, whose summing node is implemented as a low-noise capacitively coupled ampliﬁer. To compensate for the shunt’s ﬁnite temperature coefﬁcient (TC), the TC of the ADC on-chip voltage reference can be tuned. As a result, the sensor maintains high accuracy when used with low