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本文提出一种用于电流检测的高压ΔΣ ADC，采用电容耦合高压斩波器实现±30V输入共模范围，结合相关双采样和系统级斩波将失调降至8µV，在5V单电源下达到110dB SNR，解决了传统ADC在高压电流监测中共模范围受限和精度不足的问题。
input common-mode voltage range (CMVR) while powered from a single 5V supply. This beyond-the-rails capability is obtained by employing a capacitively coupled high-voltage (HV) chopper at the input of a switched-capacitor (SC) ΔΣ ADC. Furthermore, the use of correlated double sampling and system-level chopping results in a maximum offset of 8μV over the full CMVR. In contrast to a recent HV ADC [1], the ADC exhibits 30dB more resolution, while its CMVR extends below the negative rail. The ADC is intended for current monitoring applications, in which a small voltage drop across a shunt resistor must be digitized. In battery monitoring applications, or when inductive loads are involved, the differential voltage across
Long Xu1, Burak Gönen1, Qinwen Fan2, Johan H. Huijsing1, Kofi A. A. Makinwa1
Delft University of Technology, Delft, The Netherlands, Maxim Integrated Products, Delft, The Netherlands 1 2 This paper presents a high-resolution 110dB SNR ΔΣ ADC that achieves a ±30V