Fully-Integrated Autonomous K-Band Complex Permittivity Sensor in 22 nm FDSOI for Biomedical Body Parameter Monitoring Applications

This work presents a fully integrated low-power system-on-chip (SoC) for autonomous body monitoring applications in 22 nm FDSOI CMOS technology. The proposed SoC comprises a K-band complex permittivity sensor, a 10 -bit successive approximation register (SAR) analog to digital converter (ADC), an ultra-low-power (ULP) NanoController as a programmable Finite-State Machine (FSM), an integrated ULP voltage/current reference circuit, and low-drop-out (LDO) voltage regulators as a power management unit. The functionality of the dielectric sensor has been validated and calibrated using isopropanol, ethanol, and methanol solutions as material-under-test (MUT). The complete SoC occupies a chip area of $2 \mathrm{~mm}^{2}$, has an average power consumption of $14.3 \mu \mathrm{~W}$ during a $\mathbf{1 0}$-minute measurement cycle.