|Created||November 11, 2012|
|Last modified||April 15, 2013|
Q2 collector current is held roughly constant over a wide range of V1.
Use PNPs for a current source.
F5 to simulate.
The collector current of Q2 is approximately given by:
Ic_Q2 = Vbe_Q1/R1
Vbe_Q1 is between 0.55V and 0.7V, nominally 0.6V
R1 is the value of R1
So for R1 = 100R, Ic_Q2 ~ 6mA.
For background, see Fig 2.25 of:
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