A Capacitive Touch Chipset with 33.9dB ChargeOverflow Reduction Using Amplitude-Modulated Multi-Frequency Excitation and Wireless Power and Data Transfer to an Active Stylus

📋 论文概要

本文提出了一种幅度调制多频激励方法，用于电容式触摸芯片组，有效减少多TX电极同时激励时的电荷溢出问题，实现了33.9dB的电荷溢出降低，同时保持高帧率和信噪比。

💡 主要创新点

• 提出幅度调制多频激励（AM-MF）驱动方法，允许同时激励多个TX电极并减少电荷溢出
• 在不降低帧率或SNR的情况下，实现了33.9dB的电荷溢出抑制，优于传统时分、减幅或数字插值方法

🏷 关键词

📄 原文摘要

systems (CTSs), several driving methods have been reported [1-5]. However, when excitation circuits simultaneously send excitation signals (VEXTs) to multiple TX electrodes in order to increase frame rate, the readout circuit suffers from charge overflow because of the superposition of VEXTs. To prevent this, driving methods such as time-division [1,5] and reduced-amplitude excitation [3], and signal omitting and linear interpolation in the digital domain [4] have been adopted in AFE ICs, but they degrade the frame rate, and SNR, and increase the computational load of the CTS, respectively. In this paper, amplitude-modulated multiple-frequency excitation (AM-MFE) is used to prevent charge overflow without degrading the frame rate, SNR, and computational load. In addition, an

👥 作者与机构

Jae-Sung An1, Jong-Hyun Ra2, Eunchul Kang1, Michiel A. P. Pertijs1, Sang-Hyun Han3

Delft University of Technology, Delft, The Netherlands SK hynix, Icheon, Korea 3 Leading UI, Anyang, Korea 1 2 As the demand for high frame rate and SNR increases in capacitive touch