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Hello Naser,
It happens that we have measured the closed-loop Zout for the INA128. Below, you can see graphs of its Zout, output impedance and phase vs frequency. The blue curve is for an output current equal to Iq/8, and the red curve is for an output current equal to Iq/2.
The Zout of the INA128 is applicable to the INA2128 because the latter is the dual version, of the single.
Regards, Thomas
Precision Amplifiers Applications Engineering