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AFE4300 BCM AC Rectification 方式下计算阻抗能够得到相位值么?

Other Parts Discussed in Thread: AFE4300

我在看AFE4300的datasheet中,发现在AC Rectification模式说明中,有一句话“Although, with one single frequency or
measurement, only the module of the impedance can be obtained; two different frequencies could be used to
obtain both the real and the imaginary parts ”。

我不知道这个两个频率下是如何计算出来的,请问您有相关的资料或者说明么?

  • 您需要能够根据R和C建立阻抗模型,这种阻抗的幅度和相位可以用R,C和f表示,其中f是激励频率。 如果你测量两个不同频率f1和f2的阻抗大小,那么你可以得到两个带有两个变量(R和C)的方程式,从中可以求解R和C,使用它可以计算实数和虚数 部分阻抗。