A flexible low-power high-resolution integrated interface for capacitive sensors

@article{Heidary2010AFL,
  title={A flexible low-power high-resolution integrated interface for capacitive sensors},
  author={Ali Heidary and Saleh Heidary Shalmany and Gerard C. M. Meijer},
  journal={2010 IEEE International Symposium on Industrial Electronics},
  year={2010},
  pages={3347-3350}
}
This paper presents a low-power high-resolution CMOS interface for capacitive sensors. The circuit is based on the use of a switched-capacitor charge amplifier, which converts the input capacitance to a voltage, which modulates the period of a relaxation oscillator. Auto-calibration is used to eliminate the undesired effects of transfer-parameter drift. The interface is suited for capacitive sensors with capacitance values from 1 pF up to 220 pF. Moreover, the measurement time can be set from… CONTINUE READING