Single Transistor Overall Current Gain

  • Thread starter hisotaso
  • Start date
  • #1
hisotaso
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Homework Statement


THe problem statement and given solutions are in this thread:

https://www.physicsforums.com/showthread.php?t=694054

I do not understand the equation for current gain:


Homework Equations


Ai = [itex]\alpha[/itex][itex]\frac{R4}{R4 + Ri}[/itex]


The Attempt at a Solution


I have pages of work on this, but basically what I know is [itex]\frac{Io}{Ie}[/itex] = [itex]\alpha[/itex]

then [itex]\frac{Ie}{Ii}[/itex] must equal [itex]\frac{R4}{R4 + Ri}[/itex], I don't see that.
 

Answers and Replies

  • #2
NascentOxygen
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Why have you started a second thread for your own question?
 
  • #3
hisotaso
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I started a second thread because I thought I had figured it out. I stated so in that thread, and thus expected no one would reply. I asked another question about this same circuit in a third thread.
 

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