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feedback theory and input and output connection

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020170

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I saw common source amp in the book which dealt with feedback theory.

in just simple common source amp, author use feedback theory to prove some theory , Black theorem and Choma etc.

but this common source amp have no connection between input and output terminal. in my opinion, feedback must have connection between input and output terminal, but he did not.

why does he think common source amp of feedback amp ?

Is it possible to show feedback theory by using amp have no connection between input and output?

thanks.
 

The source (or emitter) load resistance changes the absolute emitter (or source) voltage. This reduces the voltage between the base-emitter or gate-source.
 

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    020170

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so clear explaination!

thanks
 

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