Design of Programmable Threshold Value Discrimination for Compton Scattering System Based on FPGA

According to the characteristics of multi-angle array Compton scattering data, a programmable threshold value discrimination system was designed. The system can read Compton scattering solution spectrum information, and sends it to FPGA module, which drive 8 DAC chips. FPGA programmed by Verilog HDL Language receives control commands from PC by serial port, then it will rapidly drive DACs to give accurate threshold values. The test shows that the system with extended design of DAC based on FPGA can give high precise and highly stabile threshold value discrimination voltage, and the values with well programmable control performance, it was suitable for the multi-angle array Compton scattering system.