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直接数字频率合成(DDS)技术在信号处理领域有广泛应用。为产生高采样率的模拟信号源,现场可编程逻辑阵列(FPGA)利用DDS技术输出数字信号,经过MUX芯片复用提高码速率,再通过DA芯片输出模拟信号。该方案调用FPGA内部并串转换器OSERDES,采用双倍数据速率(DDR)模式。多路低速信号复用成高速信号,输出不需要MUX芯片复接,直接输出到DA芯片。该方法减少中间环节,提高了稳定性。最后通过实验验证了方法的可行性。
Direct digital frequency synthesis (DDS) technology is widely used in signal processing. To generate a high sampling rate analog signal source, field programmable gate arrays (FPGAs) use DDS technology to output digital signals, multiplex the MUX chips to increase the code rate, and then output analog signals through the DA chip. The program calls FPGA internal serializer OSERDES, double data rate (DDR) mode. Multi-channel low-speed signals multiplexed into high-speed signals, the output does not require MUX chip multiplexing, direct output to the DA chip. This method reduces the intermediate links and improves the stability. Finally, the feasibility of the method is verified by experiments.