Using a single opamp with a resistor it is very easy to make a I to V converter, as shown in the diagram below. Note that if current is flowing from
I_in towards the op-amp (let's call that a positive current), then
V_out will be negative and vice versa. We can easily make
V_out have the same sign as
I_in by adding another op-amp in the inverting configuration.
However, is it possible to make an I to V converter that preserves the sign using a single op-amp?
(Of course this is possibly by building another opamp from discrete components but this is not what I mean, I just wondered whether there is some simple circuit that can achieve this with one op-amp.)
EDIT: Of course one could just take a resistor to ground for that (and optionally buffer the voltage). But this means the "input" is at the output voltage. But I'd be interested to have a convert for whicht he input is also kept at 0V just like in the inverting configuration.