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why the non inverting output is not as same as input signal?

Question asked by alirezaei on Aug 8, 2017
Latest reply on Aug 9, 2017 by alirezaei

I am using a simple Op amp. I have a 1khz square signal. I have a non inverting op amp circuit. the in put signal is 0-3v while the output signal is 0.6-3 V.

the circuit has no feedback resistor and the output is directly connected to the negative input.

where this difference come from and how can I have the same output signal as my input.

The op amp is LT1819CMS8#PBF.

Thanks for helping.