On a board I'm working with, there's a 120 ohm termination resistor. I need to measure the voltage across it and compare it against a reference voltage.
I'm wondering how to make the connections.
The op-amp has 2 inputs. The inverting input will be connected to the fixed reference voltage.
The non-inverting input should be hooked to the point where I can measure the voltage across the resistor. Voltage is usually measured between a point and the ground reference, but the voltage I need to acquire is between the two leads of the resistor.
How would I be able to connect it to the non-inverting input? Should I use a differential to single ended buffer or something of this nature?
Edit: ignore the switch.