Highly improved SNR differential sensing method using parallel operation signaling for touch screen application

2014 IEEE Asian Solid-State Circuits Conference (A-SSCC) Pub Date : 2014-11-01 DOI:10.1109/ASSCC.2014.7008884

Sanghyun Heo, Hyunggun Ma, Jae Joon Kim, F. Bien

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引用次数: 2

Abstract

In this paper, a continuous-time differential type multi-signal parallel driving architecture touch screen sensing circuit for projective capacitive type panel is presented. In order to further enhance the Signal-to-Noise Ratio (SNR), a new transmitter (TX) architecture is proposed with parallel signal processing algorithm. In this work, charge amplifiers with built-in band-pass filter are designed that filter out low frequency noise and common-mode noise simultaneously. Conventional approaches in continuous-time operation with band-pass filter suffer from a synchronization problem in the case of multi-signal parallel driving. In this work, a built-in delay calibration circuit is proposed that can align signal timing for TX signal and adjacent receiver (RX) sensing line. This proposed architecture enables multi-signal parallel driving in continuous-time operation for projective capacitive sensing circuits. The proposed work supports 16 × 8 mutual capacitive touch screen panel (TSP). TSP load is 12.5 kΩ and 40 pF with frame rate of 200 Hz and 58 dB SNR. Power dissipation is 46 mW.

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采用并行操作信号的高改进信噪比差分传感方法在触摸屏上的应用

本文提出了一种连续时间差分型多信号并联驱动结构的投影电容式触摸屏传感电路。为了进一步提高信噪比，提出了一种采用并行信号处理算法的新型发射机结构。本文设计了一种内置带通滤波器的电荷放大器，可以同时滤除低频噪声和共模噪声。传统的带通滤波器连续运算方法在多信号并行驱动情况下存在同步问题。本文提出了一种内置延迟校准电路，可以对TX信号和相邻接收机(RX)感测线的信号时序进行校准。该架构可实现投射电容感测电路连续工作时的多信号并行驱动。所提出的工作支持16 × 8互容触摸屏面板(TSP)。TSP负载为12.5 kΩ， 40 pF，帧率为200 Hz，信噪比为58 dB。功耗为46mw。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)

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