The Design of Digital Multi-channel Analyzer based on FPGA

A Digital Multi-Channel Analyzer (DMCA) based on FPGA(Field Programmable Gate Array) is introduced. The nuclear signals are processed by EP3C40Q240. It uses digital signals acquired by ADC to do calculus,seek the peaks,discriminate the threshold,and then form the energy spectrum. DMCA communicates with energy spectrum processing terminal(for example: PC) by high-speed RS485 bus interface. The software on PC can control DMCA and display energy spectrum. And the energy spectrum of 137Cs is given,which is obtained from NaI(Tl) detector and processed by DMCA.