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THS4567: input impedance FDA mode

Part Number: THS4567

Tool/software:

hello all,

i was trying to simulate the input impedance of the THS4567 in FDA mode in TINA TI with AC analysis. the real part of the impedance is as expected which is 2*RG but the imaginary part has inductive behaviour, any explaination for this or it's a problem with the simulator?