Phase change in an voltage follower

[Sambhav_1]

Hello,
IF I have an OPAMP with open loop gain ,lets say "-K", and is connected as a voltage follower. then what will be the phase change at the output.
Thank you

 

[frankrose]

Answer is more complicated than the question. Depends on load, phase margin, gain margin for example. But basically it will be a low-pass filter, with cut-off frequency around the unity gain bandwidth of the OPAmp in a general application. So phase response will be similar to an RC LPF, from 0 to -90 degrees, -45 degrees around the cut-off frequency.

 

[Sambhav_1]

surely ans seems to be more complicated .
I am nowhere close to the answer.can you suggest me any resource which i can refer.
Thanks

 

[crutschow]

There is no significant phase change until you approach the gain-bandwidth frequency of the opamp.

 

[FvM]

If the open loop gain is actually "-K" (not frequency dependent), there will be no phase shift at all. But a real world OP has at least a second order transfer function (a dominant low frequency pole and additional pole(s) slightly above the unity gain frequency). For known open loop transfer function, the closed loop behavior can be calculated, review analog circuit design text books.