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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-controlled...
A fully-integrated sensing system utilizes a ring oscillator-based phase locked loop (PLL) for wideband complex dielectric spectroscopy of materials under test (MUT). Characterization of both real and imaginary MUT permittivity is achieved with frequency-shift measurements between a sensing oscillator, with a frequency that varies with MUT-induced changes in capacitance and conductance of a delay-cell...
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