A Technique for Improving the Linear Operating Range for a Relative Phase Delay Capacitive Sensor Interface Circuit

@article{Meng2016ATF,
  title={A Technique for Improving the Linear Operating Range for a Relative Phase Delay Capacitive Sensor Interface Circuit},
  author={Yuan Meng and Robert Neal Dean},
  journal={IEEE Transactions on Instrumentation and Measurement},
  year={2016},
  volume={65},
  pages={624-630}
}
One technique for measuring an unknown sensor capacitance is using the phase delay of an RC network with a resistor and the sensor capacitor. By buffering the RC network with CMOS inverters, a square wave signal can be delayed through the circuit in proportion to the unknown capacitance. An EXOR gate can be used to compare the delayed square wave with a… CONTINUE READING