采用稀疏读出策略的电容触摸屏前端IC设计

李博; 魏廷存; 魏晓敏

doi:10.3788/YJYXS20173201.0023

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采用稀疏读出策略的电容触摸屏前端IC设计

驱动与控制 | 更新时间：2020-07-07

- 采用稀疏读出策略的电容触摸屏前端IC设计
- Design of analog front-end IC for capacitive touch screen using sparse readout strategy
- 液晶与显示 2017年32卷第1期页码：23-28
- 作者机构：
  
  西北工业大学计算机学院微电子学研究所, 陕西西安 710072
- 作者简介：
  
  [ "李博(1981-),男,陕西宝鸡人,博士研究生,2007年获得西北工业大学硕士学位,研究方向为电容传感器技术,混合信号集成电路设计。E-mail:libowxm@foxmail.com" ]
  魏晓敏,E-mail:libowxm@foxmail.com
- 基金信息：
  
  2015陕西省科技计划统筹项目(No.2015KTZDGY03-03);Supported by Project of Science and Technology Planning in Shaanxi Province(No.2015KTZDGY03-03)
- DOI：10.3788/YJYXS20173201.0023
  中图分类号： TP394.1;TH691.9
- 收稿日期：2016-07-11，
  
  录用日期：2016-9-13，
  
  纸质出版日期：2017-01
- 稿件说明：
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李博, 魏廷存, 魏晓敏. 采用稀疏读出策略的电容触摸屏前端IC设计[J]. 液晶与显示, 2017,32(1):23-28.

Bo LI, Ting-cun WEI, Xiao-min WEI. Design of analog front-end IC for capacitive touch screen using sparse readout strategy[J]. Chinese journal of liquid crystals and displays, 2017, 32(1): 23-28.
李博, 魏廷存, 魏晓敏. 采用稀疏读出策略的电容触摸屏前端IC设计[J]. 液晶与显示, 2017,32(1):23-28. DOI： 10.3788/YJYXS20173201.0023.

Bo LI, Ting-cun WEI, Xiao-min WEI. Design of analog front-end IC for capacitive touch screen using sparse readout strategy[J]. Chinese journal of liquid crystals and displays, 2017, 32(1): 23-28. DOI： 10.3788/YJYXS20173201.0023.

摘要

针对采用触摸预测和窗口采样（TPWS）稀疏读出策略实现的电容触摸屏系统容易受到显示噪声和充电器噪声干扰的问题，本文提出了并行互补驱动和差分感应的方法以提高系统的信噪比。基于本文提出的并行驱动和差分感应方法，并结合TPWS系统的特点，采用0.35

m CMOS工艺设计实现了一个48通道电容触摸屏模拟前端IC，并设计了一个11.6 in原型触摸屏系统用于评估该IC的性能。测试结果表明，本文设计的IC不仅能满足TPWS系统对于点测量和线测量的功能需求，并且系统的信噪比从原来的25.0 dB提升到了35.8 dB。

Abstract

Capacitive multi-touch screens using touch predicting and window sensing (TPWS) readout strategy are susceptible to display noise and charger noise interferences. In this paper

a parallel complementary driving and differential sensing method are proposed to improve the SNR of TPWS system. A new 48-channel analog front-end IC is designed and realized using 0.35

m CMOS process based on the parallel complementary driving and differential sensing method. In addition

an 11.6 in prototype touch screen system is designed to evaluate the performances of the analog front-end IC. The measurement results indicate that

the analog front-end IC designed in this paper can satisfies the requirements of TPWS system for line and point scanning

and furthermore

the SNR of the TPWS system is increased from 25.0 dB to 35.8 dB.

关键词

Keywords

references

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