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Input impedance calculation using DFT for Radio Frequency

MohanB

Hi

I am trying to find the input imepdance of an RF rectifier circuit by using FFT in cadence. The equation I'm using is 

                      Zin = DFT(Voltage)/DFT(Current) at the required frequency.

However, after evaluation cadence gives me only the magnitude of the impedance Zin.

How can I get both the real and imaginary parts after the above computation?

Thanks

Parents

  • The result of the dft() function in the Virtuoso Visualization and Analysis calculator (ViVA)  (assuming you're talking about the Virtuoso tools - you just said "in cadence" - there's no tool called "cadence") are complex values versus frequency. So the expression you describe above is also complex versus frequency.

    If you plot it, it automatically plots the magnitude, but you can use the real() or imag() functions to get the real or imaginary parts - you can also use the phase, phaseDeg, phaseRad, phaseDegUnwrapped etc functions to get the phase.

    Regards,

    Andrew.

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