Design of Pre-amplifier in Piezoelectric Signal Acquisition
Bai Zhi-ping · Modern Electronics Technique · 2011
Signal from piezoelectric sensor is weak and often mixed with common-mode interference.The current schemes for piezoelectric signal pre-amplifiers based on instrument amplifier always appear some problems.On basis of theoretical analysis,an improved scheme for the piezoelectric signal pre-amplifier is proposed.A prestage scheme of piezoelectric signal amplifier about voltage-parallel connection negative feedback circuit with common-mode interference attenuation is proposed.The experiment indicates that the proposed scheme can improve the SNR and restrain common-mode interference.