Ideal Voltage Transfer Curve – The ideal op-amp produces the output proportional to the difference between the two input voltages. The graphical representation of this statement gives the voltage transfer curve. It is the graph of output voltage vo plotted against the input Voltage vd assuming gain constant. This graph is called transfer characteristics,of the op-amp.
Now the output voltage is proportional to difference input voltage but only upto the positive and negative saturation are specified by the manufacturer in
The curve is not drawn to the scale. If drawn to the scale, the curve would be almost vertical due to large values of op-amp gain.
Thus note that the op-amp output voltage gets saturated at +Vcc and – VEE and it can not produce output voltage more than + Vcc and vEE. Practically saturation voltages +Vsat, and – Vsat are slightly less than +Vcc and – VEE.