A Wide-Band Fully-Integrated CMOS Ring-Oscillator PLL-Based Complex Dielectric Spectroscopy System

A fully-integrated sensing system is proposed for wideband complex dielectric detection of materials under test (MUT). The system utilizes a ring oscillator-based phase-locked loop (PLL) for wide tuning range and precise control of the sensor's excitation frequency. Characterization of both real and imaginary MUT permittivity is achieved by measuring the frequency difference between two voltage-co...