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In order to solve the problem that the MEMS sensor with piezoelectric effect generates a weak amount of charge which is inconvenient to collect and difficult to further analyze and study. This paper proposes a signal conditioning circuit based on the integrated operational amplifier chip OP07CDR. The circuit consists of four parts: power module, charge-to-voltage conversion circuit, amplifying circuit, and low-pass filtering circuit, enabling the conversion of weak charge quantities into voltage output. In addition, the charge signal generated by IEPE vibration is connected to the signal conditioning circuit for charge to voltage testing experiments. The test results show that under the condition of wide input charge of 10 pc~500 pc, the circuit can generate a smooth and regular waveform of 90 mV~4.5 V sine voltage signal. At the same time, for the voltage signal with a working frequency of 4.628 kHz, while effectively filtering out high-frequency interference, it is ensured that the main frequency signal will not have significant amplitude attenuation. In summary, the circuit has the characteristics of high integration, wide charge collection range and low pass filtering, so it has a good application prospect in weak charge signal acquisition.

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Research and Design of a Charge-to-Voltage Conditioning Circuit Based on Piezoelectric Effect

  • 会议论文

  • 发表日期：

    2025年

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  • Xuyang Wang,
  • Yongkang Yang,
  • Yuchen Shi,
  • Haitao Wang,
  • Meng Zhao,
  • Zhao Yue,
  • Jing Ji

摘要

In order to solve the problem that the MEMS sensor with piezoelectric effect generates a weak amount of charge which is inconvenient to collect and difficult to further analyze and study. This paper proposes a signal conditioning circuit based on the integrated operational amplifier chip OP07CDR. The circuit consists of four parts: power module, charge-to-voltage conversion circuit, amplifying circuit, and low-pass filtering circuit, enabling the conversion of weak charge quantities into voltage output. In addition, the charge signal generated by IEPE vibration is connected to the signal conditioning circuit for charge to voltage testing experiments. The test results show that under the condition of wide input charge of 10 pc~500 pc, the circuit can generate a smooth and regular waveform of 90 mV~4.5 V sine voltage signal. At the same time, for the voltage signal with a working frequency of 4.628 kHz, while effectively filtering out high-frequency interference, it is ensured that the main frequency signal will not have significant amplitude attenuation. In summary, the circuit has the characteristics of high integration, wide charge collection range and low pass filtering, so it has a good application prospect in weak charge signal acquisition.