I want to use OP amplifier AD822 to build a voltage follower which generate exactly the same output voltage with the input voltage. The power to OP is 5v. The input signal is 3.3v, the period is 20ms.
However, the amplitude of output voltage(green) is not 3.3v but only 2.8v. Can someone tell me why there is the gap between the input and output voltage? How can I get the output voltage with the exactly the same value as input?