The traditional touch sensing range is two dimensional and therefore limits the user experience. Touch sensing has been widely implemented as a main methodology to bridge human and machine interactions. Test result shows that the system can be very sensitive to detect if a finger touch it or not and the resolution can be adaptive by changing the frequency of the oscillator through DAC's output The design is achieved by using TSMC 65nm technology, occupying an area of 0.9mm x 1.1mm, power consumption of 10mW when oscillating at 120MHz, and runs on a digital clock frequency of 100KHz.
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Finally, a digital processing unit has been designed which is used to analyzes the change of the frequency and transfer information to PC to do post-signal processing
To make the resolution tunable, an 8 bit R-2R DAC has been implemented to change the bias voltage of the ring oscillator which will change the oscillator's resonant frequency as well as system resolution. The circuit detects the touching finger by using a 6 stage ring oscillator to sense the change of the input capacitance. In order to solve this problem, an oscillator-based touch sensor detection circuit with adaptive resolution has been presented. Current popular touch screen detection technologies include resistive, capacitance, infrared based imaging sensor however, some are designed with a fixed resolution and it is not optimal for nowadays low power requirement. In this thesis, an oscillator-based touch sensor detection circuit with adaptive resolution has been proposed.
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