Noise Immunity in Capacitive Sensing: Single-Ended AFE Design with Common-Current Subtraction for Mutual- and Self-Capacitance Sensing in 390pF Load

📋 论文概要

该论文提出了一种针对电容式触摸传感的单端模拟前端（AFE）设计，通过共模电流减法技术提高噪声抗扰度。旨在解决触摸传感器集成在显示屏中由于大寄生电容导致的信号退化问题。

💡 主要创新点

• 采用共模电流减法技术，有效抑制共模噪声，提高信噪比
• 提出单端AFE架构，支持互电容和自电容传感，降低设计复杂度和成本

🏷 关键词

📄 原文摘要

flagship smartphones thanks to their thin form factor. However, the touch sensor integrated within the display faces several technical challenges arising from large parasitic capacitance of the touch sensor [1]. A potential solution involves subdividing the line sensors into smaller segments, arranged in a matrix configuration. However, this approach comes with higher design costs, as M×N sensors need to be controlled by the touch controller, and line sensors continue to be favored for smartphone displays. In the line sensor, one significant challenge is to mitigate the degradation of touch signal quality due to the prominent display noise coupling through the large parasitic capacitance. Also, implementing self-cap sensing (SC-sensing) poses another hurdle, which is the presence

👥 作者与机构

Jun Yeol An1, Seung Hun Choi1, Si-Woo Kim2, Jae-Youl Lee2, Hyung-Min Lee1, Yoon-Kyung Choi1

Korea University, Seoul, Korea Samsung Electronics, Hwaseong, Korea 1 2 Today, flexible on-cell OLED displays have become the standard choice for