Common Emitter Amplifier Calculator

Common Emitter Amplifier Calculator

This calculator computes key small-signal parameters for a common emitter amplifier.

Assumptions: Emitter bypass capacitor is used.

Step 1: Enter Parameters

e.g., 10 mA (will be converted to A)

e.g., 100

e.g., 4700 Ω

Formulas:
Transconductance: \( g_m = \frac{I_C}{V_T} \) (with \(V_T \approx 0.025\) V at room temperature)
Input Resistance: \( r_\pi = \frac{\beta}{g_m} \)
Voltage Gain (with bypassed emitter): \( A_v \approx -g_m\, R_C \)