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How to determaine the output impedance?


I have a VCCS based on AD8130.  After many googling and studying.. now I'm frustrated!

for checking the output capacitance usually I put a 1Kohm resistor on the output and check the 3-dB corner frequency. so the output capacitance is C=1/(2*pi*R*f3dB)

But I really I don't know how I should calculate the output impedance of the VCCS.


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