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AD9364 Tx/Rx impedance

Question asked by tmain on Apr 27, 2015
Latest reply on Jun 26, 2015 by tlili

I am trying to make sense out of the charts on page 5 of the attached document.  I assume that the smith chart represents the equivalent impedance from 70 MHz to 6 GHz. From comparing the chart to the Magnitude curve, I can tell where the 70 MHz end is.  I can’t figure out the labeling on the second chart.  From looking at the impedance curve, and the Red and Blue curves, I seems to me as if the input model is a real resistance with a shunt reactance.

 

I assume that the left side scale factor of the second chart is in ohms.  The scale factor on the right side of the chart only goes from 10 on the top to 10 on the bottom. What are the units on the right side of the chart (i.e. Ohms?)  From the smith chart, it would appear that the reactive impedance is in the same vicinity as the real part for some frequencies .

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