Current-Pump, 2OPAmps (CFA & VFA)

Thread Starter


Joined Nov 19, 2023
Hi everyone! I've simulated and implemented the two-op-amp topology precission current pump described here.
Because I need to source 1A, I've choosen the LT1210, together with an LT1001.


The LTspice-simulation works as expected ... however the prototype implementation does not; the output is offset by +1V
In the prototype the top input is gnd, and the bottom input (Vd) is a 5Vpp signal, in the 50-200Hz range.

I realized that I lightly replaced the top voltage-feedback-amplifier with a current-feedback-amplifier, and am confused now if this may work at all. I hope to find the expertise here in the forum, so help is greatly appreciated!