Fn. Toth et al., A LOW-COST, STABLE REFERENCE CAPACITOR FOR CAPACITIVE SENSOR SYSTEMS, IEEE transactions on instrumentation and measurement, 45(2), 1996, pp. 526-530
A low-cost reference capacitor has been developed for capacitive senso
r systems, The capacitance has been constructed using low-cost materia
l. Over a temperature range from -25 to +75 degrees C the temperature
coefficient is less than 18 ppm/degrees C.