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An Interface based on Switched-Capacitor Sample/Hold circuit of Differential Capacitance Transducers
Satomi Ogawa,Takuya Tanigawa,Daisuke Adachi 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
For high-accuracy and high-speed signal processing of differential capacitance transducers, an interface circuitry based on a switched-capacitor sample/hold circuit using unity-gain buffer (UGB) is developed. The interface produces the output voltage which is proportional to the ratio of difference-to-sum of two capacitors of a differential transducer using only single reference voltage, Vr. Hspice simulations are described to predict performances of the interface when implemented by 0.35㎛ n-well CMOS process. Experimental results using discrete components are also given to confirm the principles of operation.