Problem statement and given solution: http://www.flickr.com/photos/96316430@N03/

Question

Problem statement and given solution:

http://www.flickr.com/photos/96316430@N03/8805855086/

I do not understand how the author got the equation for Ai (overall current gain). I understand that Io/Ii = (Io/Ie)(Ie/Ii), and since Io = Ic, Io/Ie = alpha. However this means that Ie/Ii = R4/(R4+Ri), and that I do not see.

I have had several problems with this text thus far (Jaeger), however I was using another text on google books reference, and this author has the same equation:

http://www.flickr.com/photos/96316430@N03/8862328823/

(it is a different problem, but still a single bjt common-base amp.)

Thanks in advance.

Explanation / Answer

i didnt understand what is ur question. can u explain again please.

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