A Low-Power ADC-Free Resistive Sensor Readout Circuit for μC-Based Microsystems
DOI:
https://doi.org/10.64552/wipiec.v12i2.142Keywords:
Resistive sensor, ADC-free readout, low-powerAbstract
Implantable microsystems are required to show low-volume and low-power consumption, while ensuring high reliability and safe long‑term operation. This work addresses the development and evaluation of a compact readout circuit for a piezoresistive force sensor intended for integration in an active oral prosthesis. The approach proposed here can be included in the direct-to-microcontroller interface methodologies, but relies on a sigma-delta-like measurement process. Its performance has been experimentally compared to conventional Wheatstone bridge and simple voltage-divider topologies, showing, respectively, 76% and 44% reductions in power consumption, while ensuring 8 times better resolution.
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