An accurate interface for capacitive sensors

@article{Li2002AnAI,
  title={An accurate interface for capacitive sensors},
  author={Xiujun Li and Gerard C. M. Meijer},
  journal={IEEE Trans. Instrumentation and Measurement},
  year={2002},
  volume={51},
  pages={935-939}
}
A new smart interface based on a first-order chargebalanced SC-oscillator is presented for capacitive sensors, which are shunted by a parasitic conductance. In the novel interface, the effect of shunting conductance is reduced by using the charge/discharge method. The effect of the stray capacitances is eliminated by using the two-port measurement. Moreover, all multiplicative and additive errors of the interface are also eliminated by using the auto-calibration technique and the chopping… CONTINUE READING

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