For simulation purposes, I know that one can setup a difference amplifier configuration and compensate for offsets for DC current by adding a voltage source on the inverting input, and adjusting it's value until output voltage is zero.
I tried the same thing for AC current, but it doesn't work. The offset is reduced a little bit, but it doesn't go below ~20uV RMS.
Basically I want to output a very small AC voltage from the differential amplifier, in the range of microvolts. Unfortunately, at that range the offset dominates the output.
How does one achieve 0V offset for AC current?