A fully-digital, 0.3V, 270 nW capacitive sensor interface without external references

@article{Danneels2011AF0,
  title={A fully-digital, 0.3V, 270 nW capacitive sensor interface without external references},
  author={Hans Danneels and Kristof Coddens and Georges G. E. Gielen},
  journal={2011 Proceedings of the ESSCIRC (ESSCIRC)},
  year={2011},
  pages={287-290}
}
This paper presents a fully-digital capacitive sensor interface. By directly transforming the sensor value instead of using an intermediate step in the voltage domain, the architecture can cope with very low signal swings. An implementation for barometric pressure sensing with a supply voltage of 0.3 V demonstrates the benefits. With a power consumption of only 270 nW and an acquisition time of 1 ms, an ENOB of 6.1 is obtained, resulting in a FOM of 2.1 pJ/conv for the entire interface. This is… CONTINUE READING
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