I am trying to analyse the voltages in a voltage-controlled current source.

What I have so far:

* Vin = V\_C
* V\_B = Vsupply - I\_shunt\*R\_load

However, I don’t know how to find an equation for the op amp’s output voltage at the gate of the FET (V\_A).

Could you please help explain/show how I’d be able to find the voltage at node A? I am really stuck since I don’t know how to find the the output voltage of an op amp when a relationship between the input and output voltage can’t be found using nodal analysis.

Any help would be greatly appreciated!

[![enter image description here](https://i.stack.imgur.com/OLcJl.png)](https://i.stack.imgur.com/OLcJl.png)