Consider the npn BJT amplifier circuit in the below figure. Assume that the source provides a small signal vsig and the BJT has β = 100. Neglect Early effect (ro). VT = 25 mV. Assume IB ≈ 0 or IE ≈ IC (or α ≈ 1 ). (a) Draw the small-signal equivalent circuit. Use the T-equivalent model (αi -version) to replace the BJT. (b) Determine the overall voltage gain (vo/vsig).
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Consider the npn BJT amplifier circuit in the below figure. Assume that the source provides a small signal vsig and the BJT has β = 100. Neglect Early effect (ro). VT = 25 mV. Assume IB ≈ 0 or IE ≈ IC (or α ≈ 1 ). (a) Draw the small-signal equivalent circuit. Use the T-equivalent model (αi -version) to replace the BJT. (b) Determine the overall voltage gain (vo/vsig).
