Abstract
In this study, an appropriate negative impedance converter (NIC) circuit is designed to improve the receiving sensitivity of a flexural-type piezoelectric sensor. The negative electric elements of the NIC circuit reduce the mechanical resistance of the sensor in resonance, and consequently control the vibration characteristics. Experimental results show that the receiving sensitivity of the designed sensor with the NIC circuit can be improved such that it is much higher than that of a sensor without the circuit.
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