puzzled with the negative feedback system

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In the negative feedback system ,why should we consider the feedback
block as an isolate
block to  the amplifying block? Should't we consider about  the input
resistance of the  the
amplifying block? If the input resistance of the amplifying block is
considered, there will
be a complexed problem in the transistor circuit. What should we do
while we are analysising
the analog negative feedback system?
Thanks in advance!

Re: puzzled with the negative feedback system

. What should we do
Quoted text here. Click to load it

A lots of things.
Depends on design application and application of design..

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