Journal
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
Volume 51, Issue 5, Pages 935-939Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2002.807793
Keywords
capacitance measurement; capacitive sensors; oscillators
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A new smart interface based on a first-order chargebalanced SC-oscillator is presented for capacitive sensors, which are shunted by a parasitic conductance. In the novel interface, the effect of shunting conductance is reduced by using the charge/discharge method. The effect of the stray capacitance is eliminated by using the two-port measurement. Moreover, all multiplicative and additive errors of the interface are also eliminated by using the auto-calibration technique and the chopping technique.
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