Design and Application of Digital Filter for Quadrupole Mass Spectrometer Based on Field Programmable Gate Array

Digital filtering is one of the most important methods to improve the signal-to-noise ratio of quadrupole mass spectrometer. Aiming at the insufficient data processing capacity of the control system in miniature quadrupole mass spectrometers, one solution of digital filtering which based on FPGA was proposed in this work. The FPGA program instead of the general processor program was used to perform digital filtering operations, which improved the data processing capability of the instrument control system and completed high-order digital filtering. In miniature quadrupole mass spectrometer developed by our team, the solution here was used to achieve 130-order digital filtering. The high frequency noise attenuation of the perfluorotributylamine standard sample was more than -50 dB. The power consumption was only increased about 190 mW, which accounted for about 1. 7% of the total power consumption of the control system. Meanwhile, it solved the problem of easy data loss caused by general processors for digital filtering, and provided design reference for other low-power control systems to complete high-performance data processing.