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| Design of Multi-channel Weak Signal Conditioning Circuit for Fluctuating Pressure of Rocket Test Platform |
| Received:February 04, 2021 Revised:February 16, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.03.013 |
| KeyWord:fluctuating pressure weak signal conditioning miniaturization anti-interference |
| Author | Institution |
| ZHANG Qi |
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China |
| NIE Fei |
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China |
| ZHANG Cheng |
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China |
| QIAO Gang |
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China |
| LUO Cheng-gang |
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang , China |
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| Abstract: |
| The purpose of this study is to design the weak signal conditioning circuit for multi-channel fluctuating pressure of rocket test platform. The low noise amplifier circuit is designed based on high performance instrument amplifier. An RFI filter is introduced into the input terminal of the instrument amplifier to suppress RF interference and significantly reduce the output noise of the circuit. Furthermore, ADC conversion unit is integrated with the analog signal output terminal to realize the digital transmission of analog signals and further reduce the interference in the analog signal transmission. The signal conditioning circuit is miniaturized and integrated into a single 40 mm×35 mm circuit board to realize the functions of four-channel fluctuating pressure sensor power supply, signal conditioning and digitization. The multi-channel signal conditioning circuit is created through the combination of multiple single boards. The background noise level of the signal conditioning circuit is obtained, and the design of signal conditioning circuit is verified by wind tunnel test. Characterized by anti-interference, small size and combined circuits, the multi-channel weak signal conditioning circuit can be applied to the rocket test platform. |
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