How can I get the voltage on a current source (I=0 A) using abm voltage?

[antoineclenet]

HI, I'd like to export in Vout the voltage Vin using an ABM voltage source (see the picture below).

I don't want to use a nonlinear dependant source because I'm working with voltages of about 1 pV and nonlinear dependant sources degrade the results because of their input impedances (1 GOhms).

Thanks,

[OStep]

to reference voltages using the ABM sources, use the V(nodename) syntax. 

So in your case, assuming the nodes on the left are IO1 and IO2, the expression would be "V(IO1)-V(IO2)", without the quotes