Common Base Amplifier Calculator (Small Signal Analysis)

Common Base Amplifier Calculator

Calculate key small-signal parameters for a common base amplifier.

Assumption: Thermal voltage \(V_T \approx 0.025\,V\) at room temperature.

Step 1: Enter Parameters

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

e.g., 4700 Ω

e.g., 100 (used here for calculating an approximate input resistance)

Formulas:
Transconductance: \( g_m = \frac{I_E}{V_T} \) (with \(V_T \approx 0.025\,V\))
Input Resistance: \( r_{in} \approx \frac{1}{g_m} \) or approximated as \( r_{in} = \frac{\beta}{g_m} \)
Voltage Gain: \( A_v \approx g_m\, R_C \)