I am trying to find the input offset voltage of a differential amplifier using PSPICE . I know the process for finding it is to ground one input and do a voltage sweep at the other input and the value that forces the output to zero is the answer. My problem is that it does not go to zero, instead it starts at 1.822 and levels off at something slightly higher. I have attached my diagram, the circuit we are modeling and my output graph. Is there something wrong with my circuit or methods? Any help is appreciated

Thanks,

Goose

 

Goose12, did you try a negative input voltage? Normally, the sign of an offset is unknown.

 

That did it, thank you very much!