Hey guys,
So I'm required to design a BJT common collector amplifier. We were told to use the circuit from the textbook (picture provided below). It has to have a current gain of 20.
Beta = 100
ic= 10mA
Vce= 1.0V
What I've done so far is used all the formulas on the other page (pic below) and pretty much worked backwards playing around with the numbers until I got a current gain of 20 (Ai).. I ended up with these values:
R1=R2= 80k
Rb=40k
R'L= 0.39
RL = 1k
Re=0.4
rπ= 0.65
Av= 0.999
Zit= 40k
Zi= 20k
Ai= 19.98
G= 19.96
But when I try actually apply it all...nothing checks out. I'm probably approaching it all wrong.
Thanks in advance guys.
So I'm required to design a BJT common collector amplifier. We were told to use the circuit from the textbook (picture provided below). It has to have a current gain of 20.
Beta = 100
ic= 10mA
Vce= 1.0V
What I've done so far is used all the formulas on the other page (pic below) and pretty much worked backwards playing around with the numbers until I got a current gain of 20 (Ai).. I ended up with these values:
R1=R2= 80k
Rb=40k
R'L= 0.39
RL = 1k
Re=0.4
rπ= 0.65
Av= 0.999
Zit= 40k
Zi= 20k
Ai= 19.98
G= 19.96
But when I try actually apply it all...nothing checks out. I'm probably approaching it all wrong.
Thanks in advance guys.
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