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Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
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Multiple capacitors can be connected in a circuit in series or parallel configuration. When the capacitor combination is connected to a battery, the potential drop across each capacitor and the magnitude of charge stored in the individual capacitor depends on the type of the connection. The capacitor combination is replaced by a single equivalent capacitor that stores the same amount of charge as the combination for a given potential difference.
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Design Example: Capacitance Multiplier Circuit01:20

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In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
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Related Experiment Video

Updated: Aug 2, 2025

Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique
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Self Capacitance Mismatch Calibration Technique for Fully-Differential Touch Screen Panel Self Capacitance Sensing

Siheon Seong1, Sewon Lee1, Sunghyun Bae1

  • 1School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea.

Sensors (Basel, Switzerland)
|April 13, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a touch screen panel (TSP) self-capacitance sensing (SCS) system with a novel calibration technique. It effectively resolves signal-to-noise ratio (SNR) loss caused by self-capacitance mismatch, improving performance.

Keywords:
analog front-end (AFE)self-capacitance sensingtouch screen panel (TSP)

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Integrated Circuit Design

Background:

  • Touch screen panels (TSPs) commonly use self-capacitance sensing (SCS).
  • Self-capacitance mismatch in TSPs degrades analog front-end (AFE) performance, limiting dynamic range and gain.
  • This degradation leads to significant signal-to-noise ratio (SNR) loss in TSP SCS systems.

Purpose of the Study:

  • To present a fully-differential TSP SCS system incorporating a self-capacitance mismatch calibration technique.
  • To address the dynamic range degradation and SNR loss issues caused by TSP self-capacitance mismatch.
  • To develop an efficient calibration method that minimizes area and power consumption.

Main Methods:

  • Implementation of a fully-differential touch screen panel (TSP) self-capacitance sensing (SCS) system.
  • Introduction of a self-capacitance mismatch calibration technique.
  • The calibration method adjusts input resistance and driving amplifier strength in the fully-differential input to counteract mismatch effects.

Main Results:

  • The proposed calibration technique efficiently relieves the effects of self-capacitance mismatch.
  • The method achieves significant improvements in terms of area and power consumption.
  • A notable restoration of signal-to-noise ratio (SNR) by 19.54 dB was achieved, even under the most severe mismatch conditions.

Conclusions:

  • The developed fully-differential TSP SCS system with mismatch calibration effectively overcomes performance limitations.
  • The proposed calibration technique offers a power- and area-efficient solution for enhancing TSP SCS performance.
  • This approach significantly improves the signal integrity and reliability of touch screen sensing systems.