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THis output stage along with gain stage will be part of feedback amplifier, feedback used for fix gain and the output impedance is usually rout/(1+AB) wehre B is the feedback factor. Are you refering to this feedback taht eventually reduces the output impedance i.e. the output impedance of the invertor? Thank you!!

or are you refering to any feedback mechanism just for the invertor, in which case can you please site an example to refer to. Thank you!!