Electronics Forum / Electronics / March 2006

In the voltage-current negative feedback,what is the value of the
negative feedback voltage of the output voltage?
It says that "Vref=Vo*Re1/(Re1+Rf)" in the text book,why is that?
Should I consider the output resistance of the emission pole of the
first transistor?I think the Re1 should be taken place by
Re1//(rbe/(ß+1)),and there also should be an equivalent negative
voltage that equals to be vi*rbe/(Re1*(ß+1)).
I think there may be something wrong with my consideration, who can
help me?
Is there any way  to upload the schematic?
Thanks in advance!