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AGC without phase shift
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Zero999:

--- Quote from: sanwal209 on February 18, 2019, 09:51:38 am ---I have attached some circuits which i simulated and got the phase shift.

--- End quote ---
How much phase shift does the simulator show?

Please post the results.
Audioguru:
The Wien Bridge oscillator has only one output so it does not have a second signal to compare with its output phase.
Zero999:

--- Quote from: Audioguru on February 18, 2019, 07:14:47 pm ---The Wien Bridge oscillator has only one output so it does not have a second signal to compare with its output phase.

--- End quote ---
I presume the idea is not to build the oscillator part, just the AGC. R2, R2, C1 & C2 will be omitted and the signal applied to the non-inverting input of the op-amp.
Zero999:
Awhile ago I designed a microphone AGC for a project which got cancelled. Once the gain had stabilised, there was minimal distortion and phase shift, other than the usual 180o expected from an inverting amplifier.

Perhaps the original poster has selected the wrong value for an AC coupling capacitor.

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