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3D Sensor for High Resolution Touch Panel Using Bootstrapped Oscillator-based Self-Capacitance Sensing

  • Author(s): Zhang, Yan;
  • Advisor(s): Chang, Frank M.-C.;
  • et al.
Abstract

An oscillator-based self-capacitance sensing front end system is designed for the commercial grade projected capacitive touch panel. The self-capacitance architecture has potential in terms of 3D extended-range sensing in the vertical (Z) direction however planar resolution (X and Y directions) resolution had to be compromised if it were directly applied to the panel, which is designed for change-transfer based sensors. Incorporating the technique of bootstrapping to null the coupling capacitance between sensing channels, planar resolution can be restored and better Z direction range can be achieved. The design is realized in 65nm and has submitted to TSMC for fabrication.

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