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A capacitance deviation-to-time interval converter is presented for interfacing capacitive sensors. It consists of two ramp integrators, two current-tunable Schmitt triggers, and two logic gates. A prototype circuit built using discrete components exhibits a resolution as high as 13bits and a linearity error less than ±0.2% when the output pulse width is counted by a 20MHz clock signal. Its application to a humidity sensor is also presented.

Capacitance deviation-to-time interval converter using current-tunable Schmitt triggers