In the paper,a multi-channel high-precision analog signal output system is designed based on domestic FPGA chip FMK50.The 14 bit high-precision DAC controlled by FPGA is designed to complete the digital to analog conversion,and the generated signal is output through 96 channels through high-speed analog switch and sample and hold circuit.The internal ADC is used to cooperate with the host computer to design the self-test module to recover and calibrate 96 output signals.The test results show that the system can stably output configurable 0~5 V voltage signal on the basis of 100% domestication,and the accuracy is better than 0.2%FS.The design of self-test module greatly improves the output accuracy and automation of the system.
Key words
FMK50 /
signal source /
high-precision /
FPGA
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