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A high accurate signal generator based on direct digital frequency synthesis

机译:基于直接数字频率合成的高精度信号发生器

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In this paper, a four-channel high accurate sinusoidal signal generator to be used for the impedance measurements is presented. The whole system is constituted by the master-slave processor structure. Direct digital frequency synthesis (DDS) and the SOPC system are realized by the Nios II soft-core CPU embedded into the FPGA. The results demonstrate that the signal generator''s amplitude stability is with a relative uncertainty of 1.3 ×10−7 at frequency from 0Hz to 1592Hz when the phase is changed.
机译:本文提出了一种用于阻抗测量的四通道高精度正弦信号发生器。整个系统由主从处理器结构组成。直接数字频率合成(DDS)和SOPC系统是通过嵌入FPGA的Nios II软核CPU来实现的。结果表明,在相位变化的情况下,频率从0Hz到1592Hz时,信号发生器的幅度稳定性相对不确定度为1.3×10 −7

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