文章探讨了DAC在低于奈奎斯特率的采样率下合成高中频信号的方法,提出了通过后端的运放、高速电子开关以及延迟电路,利用单个DAC实现高中频信号一个周期内的双相位输出,在第二奈奎斯特域直接合成高中频信号的方法,并且对产生信号的频谱进行了分析,提出了补偿方案,给出了仿真与实验结果。 This paper discusses the method of DAC synthesizing high frequency and intermediate frequency signal under the sampling rate lower than Nyquist rate and proposes a method of synthesizing high and medium frequency signal by DAC at the back end of op amp, high speed electronic switch and delay circuit. Phase output, in the second Nyquist domain direct synthesis of high frequency signal method, and the signal spectrum is analyzed, the proposed compensation scheme, given the simulation and experimental results.