Active RC-Filter with Differential Input for Signal Processing of Piezoelectric Sensors

A method is proposed for increasing the guaranteed attenuation of the amplitude-frequency characteristic of the active RC filter (ARCF) for processing piezoelectric signals of sensors outside the band-pass of the desired signal. This effect is provided by the balanced differential input of the ARCF and the original circuit design of its basic functional units. The results of computer simulation and experimental research of the ARCF in the structure of the measuring system of the machine for dynamic of rotors are given, which show that the modified ARCF enable to improve the metrological characteristics of electromechanical balancing systems of this class.