JSSC 2024第12期Data Converters130nm CMOSDACBandgap Reference

A 14-b BW Power Scalable Sensor Interface With a Dynamic Bandgap Reference Zhong

一种14位带宽可扩展的传感器接口，采用动态带隙参考和电容偏置浮置逆变放大器技术。

14位分辨率，98 Hz至5.9 kHz带宽，84.5 dB SNDR，1.7–50.8 µW功耗

传感器接口动态带隙参考电容偏置温度补偿带宽可扩展

▸动态带隙参考（BGR）技术，无需额外参考缓冲器或去耦电容

▸电容偏置浮置逆变放大器（FIA）实现的全动态调制器

▸时域温度补偿方案，实现宽温度范围内的稳定性能

Abstract

This article presents a 14-bit fully dynamic sensor interface that consists of a switched-capacitor (SC) 16 mod- ulator and a dynamic bandgap reference (BGR). The BGR is implemented by summing the proportional to absolute tem- perature (PTAT) and complementary to absolute temperature (CTAT) outputs of two PNP-based capacitive DACs. At the sampling rate, the DAC capacitors are pre-charged to the supply and then discharged for a fixed period via PNPs, thus biasing them and simultaneously sampling