In order to compare the different circuits, you assume a base current IB1 = 0,1 μA into the transistor T1 and a gain β = 200 for all transistors. As a result the following currents flow in the circuits...
![]() Currents in the Darlington Pair. |
![]() Currents in the PNP Darlington Pair. |
![]() Currents in the Sziklai Pair. |
![]() Currents in the PNP Sziklai Pair. |
With the knowledge of the currents, you can now easily calculate the gain of the entire circuit...