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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 1.3X10~(-7) at frequency from 0Hz to 1592Hz when the phase is changed.
机译:本文介绍了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构成。直接数字频率合成(DDS)和SOPC系统由嵌入FPGA中的NIOS II软核CPU实现。结果表明,当相位改变时,信号发生器的幅度稳定性在0Hz至1592Hz的频率下具有1.3×10〜(-7)的相对不确定度。

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