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.
Thank's for your attention and recommendation
I've studied many papers about VCCS. (almost all papers )
it is one of the first application notes that I had studied before
one of the worst drawback of such circuit is the mismatch between resistors.
if you want a good accuracy it's better to use very accurate resistors (0.005% or better)
it's a good paper to talk about it:
I think AMP03 or INA105 are good choices for such application.
so you need a unity gain feedback (I'd like to call it a moderate version)
if you want very accurate VCCS it's better to use a DC stabilized feedback. (I'd like to call it a advanced version)