Metrological Evaluation of Robust Relaxation-Oscillator Interface for Remote Resistive Sensors and its Application towards Realizing Few Industrial Measurement Systems

A robust relaxation-oscillator-based conditioning circuit for remotely located resistive sensors is proposed in this article. The uses a simple analog architecture comprising an integrator, Schmitt trigger, inverter, and novel switching logic as its core blocks. provides linear digital indication of the sensor resistance. output independent many non-idealities such bias-current offset voltage Op-amps, connecting lead switch on-resistances, mismatch/drift components power-supply levels. has capability to render all these merits while interfacing with various types configurations. working mechanism analysis are described first performance verified using simulation experimental studies. Later, immunity developed from effect parameters also experimentally verified. Results show that possesses generates low error output. maximum nonlinearity merely 0.07 % when typical single-element-based interfaced circuit. features compared prior art observed be adequate industrial sensors.