A simplified small-signal equivalent circuit of a BJT-based amplifier is given below. The small-signal voltage gain Vo/Vs (in V/V) is _________.

$\frac{-\beta R_L}{R_S + r_\pi}$

$\frac{+\beta R_L}{R_S + r_\pi}$

GATE 2025 Electronics & Communication Q21 — Electronics and Communication Engineerin

GATE 2025Set MasterQ21MCQanswer keyexplanation soonmedium

Electronics and Communication Engineering · Analog Circuits - BJT Amplifiers

Concept intelligence

Drill mode: Amplifier · 2/10

Figure from the original GATE 2025 paper. (IIT Roorkee archive)

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BJTamplifiersmall-signalvoltage gainequivalent circuit