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# A relaxation-oscillator-based interface for high-accuracy ratiometric signal processing of differential-capacitance transducers

@article{Mochizuki1998ARI, title={A relaxation-oscillator-based interface for high-accuracy ratiometric signal processing of differential-capacitance transducers}, author={Kouji Mochizuki and Kenzo Watanabe and Takashi Masuda and Motoyasu Katsura}, journal={IEEE Trans. Instrumentation and Measurement}, year={1998}, volume={47}, pages={11-15} }

- Published 1998 in IEEE Trans. Instrumentation and Measurement
DOI:10.1109/19.728780

For high-accuracy signal processing of differentialcapacitance transducers, an interface circuitry is developed based on a relaxation oscillator. Two capacitors of the transducer are multiplexed by diode switches to form the op-amp-based integrator. The duty ratio of the oscillator output then measures the ratio of two capacitances. A circuit analysis shows that the interface can detect the capacitance change as small as 0.01% of the total capacitance. Experimental results are also given to… CONTINUE READING

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