Are there exceptions to adding h parameters in feedback problems of amplifiers?

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Homework Statement



In feedback problems of amplifiers we often use H feedback in the voltage controlled voltage sources... The good thing about that is that they are connected in series parallel form and they are then to find the net h parameters we simply add the h parameters of the amplifier (taken alone) to the h parameters of the feedback network (taken alone) respectively.

I was wondering if there are exceptions to this rule... I mean we connect the amplifier to the feedback network then isn't there a possibility that the individual parameters kind of change, maybe because of loading or something alike... Or is it impossible to happen. Can you give me some proofs?


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