Let's make everything ideal by ignoring the voltage drops:
Q1's allowed collector current is: 22.4 mA
Q2's allowed collector current is: 4.2mA
Total available: 300uA
I need to know if we have a limited current source and multiple collector are drawing current from it (as above), do each collector draw currents proportional to what they would've been drawing if they would be drawing from a non-limiting current source?
According to LTSpice, this will be around:
- Q1's collector current: ~252 uA --> 300uA * 22.4mA / (22.4mA + 4.2mA)
- Q2's collector current: ~47 uA
As LTSpice's own component library is different valued, and one might be comparing from another simulator that happens to be non-SPICE, these are just simple calculation from the numbers we have above. But if one were to add up the actual values in LTSpice (and other non-idealities), it really obeys this proportionality.
CircuitLab seems to give another result. Q1 apparently goes in Reverse Mode and everything adds up.
Intuition tells me that unless the difference in Q1 and Q2's "collector current allowed" is really big they will have nearly the same amount of current.
So which one should I trust?
I could also breadboard it, but I hardly think an example is a guarantee.