Please expound on the discussion of open-loop gain linearity on page 10 of the OP77 Rev E datasheet. The write-up does not go into much detail and the plots confuse me. Both graphs plot some unknown voltage Vy versus the circuit output voltage Vx. What is the voltage, Vy? Perhaps if I had this information I'd understand why an ideal op amp would have a horizontal plot of Vy Vs. Vx (whatever Vy is).
My application requires a precision amplifier with no crossover distortion.
Thank you in advance for you help.