An accurate microcontroller-based system for capacitance measurement

Abstract EN

A new accurate capacitance-measurement system comprising of a discrete capacitance-dependent oscillator and a microcontroller has been designed.

The design eliminates the parasitic capacitances and measurable humidity effects.

Moreover, it reduces the op-amp nonidealities and temperature effects to below 10 ppm/°C over the temperature range of 10 °C to 70 "C.

It can measure the capacitance up to 100 pF with resolution 40 aF and accuracy less than 80 ppm with respect to a reference capacitor.