Common emitter amplifier equivalent circuit — Free Electronics Illustration

Electronics

Common emitter amplifier equivalent circuit

Compact black-line small-signal common-emitter BJT amplifier schematic centered on the hybrid-pi equivalent model. Show labeled transistor terminals B, C, and E, with base input on the left, collector output at the upper right, and emitter at the bottom tied to ground. Include r_pi between base and emitter, a dependent current source labeled g_m*v_pi from collector to emitter, ro between collector and emitter, and parasitic capacitances Cpi and Cmu in the hybrid-pi configuration. Also include base spreading resistance rx in series with the input, source resistor Rsig, bias resistor RB, collector resistor RC, load resistor RL, and voltage labels such as v_pi and v_o. Use standard schematic symbols with resistor zigzags, simple capacitor symbols, and clean textbook-style line art.

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