Research on Multi-Channel Weak Current Quasi- Synchronous Measurement Technology Based on FPGA

Based on the current demand for real-time detection and reading of the size and spatial distribution of the extracted beam by negative ion sources, this paper proposes a multi-channel weak current quasi synchronous measurement scheme based on FPGA. The capture of the beam passing through the Faraday cup array is converted into a micro weak current array with spatial position relationship, which is then converted into a voltage signal through a conditioning amplification circuit and collected through a high-precision ADC chip, Finally, the reconstruction of multi-channel weak current is completed on the host computer. The experimental results indicate that based on this scheme, accurate measurement of 10μA-120μA ampere weak current can be successfully achieved.