There are many things regarding variation, moisture level, detector circuit, capacitive sensor interface, phase difference, sensitivity, resolution, fringing field capacitance, voltage, sensor, accuracy, sensing, low pass filter, sensor interface, detection circuit, and voltage signal are presented in the paper. Inside the paper we can read things around interface, capacitive sensor, difference, filter, output, design, current source, engineering, noise, detector, voltage sensing, sensor interface circuit, charge pump circuit, process, and phase detection.
This paper contains discussion regarding capacitances, journal, equation, electric field, phase, circuit, capacitance, pass filter, switched capacitor technique, interface circuit, switched capacitor, technique, phase detector circuit, detection, and electric field sensor. These are chosen from this paper:
A new interface circuit for capacitive sensor is presented. This paper presents the design and simulation of soil moisture capacitive sensor interface circuit based on phase differential technique. The circuit has been designed and fabricated using MIMOS’ 0.35 m CMOS technology. Simulation and test results show linear characteristic from 36 – 52 degree phase difference, representing 0 – 100% in soil moisture level. Test result shows the circuit has sensitivity of 0.79mV/0.10 phase difference, translating into resolution of 10% soil moisture level.
Furthermore, this paper explains info around phase detector, frequency detector, moisture, signal, current, technology, phase frequency detector, capacitor technique, response, frequency, phase shift, pump circuit, phase detection circuit, simulation, and sensing circuit.