In order to measure negative current without a negative supply, I mix the current sense signal with the positive reference. Now, when the current increases, the control signal decreases. To stabilize a specific current level, I need to compare the control signal with the reference, and the simplest way I see is just to flip opamp inputs and feed a reference to the inverting input and control signal to the noninverting one such that the whole assembly has negative feedback. One thing that confuses me is I’ve never seen reference to the inverting input of the opamp before.Another solution with classical configuration (reference to the non-inverting input) involves one more transistor and resistor to invert the opamp signal. But that appears to be more complicated than it needs to be.
What should I pay attention to?
