Improving the resolution in direct inductive sensor-to-microcontroller interface

The paper describes an improved direct inductive sensor to microcontroller interface by incorporating external MOSFET transistors. In such a way, the measured discharging time interval can be increased (through the discharging time constant) which results in increased resolution for a given time base. The experimental results show that the resolution of the measurements can be significantly improved in comparison to the basic low pass filter and high pass filter topology. Moreover, such circuit can be used to interface inductive sensors with lower inductance.