Exercise 3.13 Biasing in an FM transmitter circuit


An answer:

IC = βfe ⋅ IB IB = V C − 0.6 R2 V C = V CC − R3 ⋅ (IC + IB) ⟹ IC = βfe ⋅V CC − R3 ⋅ ICβfe+1 βfe − 0.6 R2 = βfe ⋅ V CC − 0.6 R2 + (βfe + 1)R3 ≈ 3mA