"collectorQ3 = Iemitter = (Vzener - VBE) / R6
Plugging in numbers, Icollector of Q3 works out to be approx 2.7 milliamps.
The first stage's bias current is just a resistor ratio multiplication of the reference current
IcollectorQ7 = IcollectorQ4 * (R7 / R11)
In the same exact fashion, the second stage's bias current is another resistor ratio times Ireference
IcollectorQ12 = IcollectorQ4 * (R7 / R20)"
Snipped from post #1. The same amount of current flows through Q3 and Q4 so you can just run the numbers and add up the currents for your answer.
Plugging in numbers, Icollector of Q3 works out to be approx 2.7 milliamps.
The first stage's bias current is just a resistor ratio multiplication of the reference current
IcollectorQ7 = IcollectorQ4 * (R7 / R11)
In the same exact fashion, the second stage's bias current is another resistor ratio times Ireference
IcollectorQ12 = IcollectorQ4 * (R7 / R20)"
Snipped from post #1. The same amount of current flows through Q3 and Q4 so you can just run the numbers and add up the currents for your answer.
Total current = (current in Q4) + (current in Q7) + (current in Q12).
Post #1 contains equations that calculate each of these. If you need help doing the computations, I'm sure other readers will be glad to offer assistance.
edit- Whoops, didn't see post #161 above. Thank you @william2001 !
Post #1 contains equations that calculate each of these. If you need help doing the computations, I'm sure other readers will be glad to offer assistance.
edit- Whoops, didn't see post #161 above. Thank you @william2001 !