DC Bias

The CE amp is biased by the voltage divider consisting of R₁ and R₂. The EF amp is biased by the collector voltage of Q₁. The main thing to understand for easily determining the DC bias of this circuit is that due to $\beta$ multiplication, usually I_B2 is negligible compared to I_C1 and can be neglected when calculating V_C1. Once this approximation is made, the CE amp can be biased using the procedure identical with the one we used in Section 2.3 for the single transistor CE amp, without worrying about the EF amp. Once V_C1 is established, the bias of the EF amp is then immediately determined by assuming V_B2= V_C1: then V_E2=V_B2-0.7, and of course V_C2=V_CC.

Using the information above, determine the values of the DC voltages V_C1, V_B1, V_E1, V_B2, V_E2, and V_C2.