Jess Chen
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As I understand your problem, you want to measure the impedance looking into a load while it is being driving by another circuit. If that is true, you should be able to drive the node between the source and load with a current source and place current probes on either side of the injection point. You can then compute zload, as well as zsource, by taking the ratio of the voltage at that node to the appropriate current. You can then convert the impedances to reflection coefficients. You should be able to write some waveform calculator functions to streamline the computations.
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