Hybrid Pi Common Emitter BJT Calculator

This calculator computes the Input Resistance (Ri), Small signal output resistance (r0) and Small signal diffusion resistance (rp). The hybrid-pi model is a linearized two-port network approximation to the BJT using the small-signal base-emitter voltage and collector-emitter voltage as independent variables, and the small-signal base current and collector current as dependent variables.

Input Resistance for the Hybrid Pi-model CE BJT circuit

Early Voltage (V_A)

Base Currrent (I_B)

Calculate drain current here

Common Emitter current gain ( β)

R₁

K-Ohm

R₂

K-Ohm

Emitter Resistance (R_E)

K-Ohm

Result

Small signal output resistance (r₀)

K-Ohm

Small signal diffusion resistance (rπ)

K-Ohm

Input Resistance (R_i)

K-Ohm

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where

rπ=small signal diffusion resistance

r₀=small signal output resistance

β=Common Emitter current gain