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A high-accuracy high-speed signal processing circuit of differential-capacitance transducers

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3 Author(s)
Mochizuki, K. ; Numazu Coll. of Technol., Japan ; Watanabe, K. ; Masuda, T.

For high-accuracy signal processing of differential-capacitance transducers, an interface circuitry is developed based on a relaxation oscillator. The interface consists of an integrator, a differentiator, and a comparator, and it uses two capacitors of the transducer-one for the integration and the other for the differentiation. This configuration allows the ratiometric operation in the amplitude domain and provides a square wave whose amplitude is proportional to the ratio of the capacitance difference between the two transducer capacitors to their sum. A circuit analysis shows that the interface can detect the capacitance change as small as 0.1% of the total capacitance in 10 μs. Experimental results are also given to confirm the analysis

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Instrumentation and Measurement, IEEE Transactions on  (Volume:47 ,  Issue: 5 )