h-Parameters

Hybrid model for the transistor amplifier can be derived as shown below:

By considering CE configuration as show in the figure 3. The variables, i_B, i_C ,v_C, and v_B represent entire instantaneous currents and voltages iB and vC can be taken as the independent variables and v_B, I_C as the dependent variables.

Fig. 1

v_B = f₁ (i_B ,v_C ) I_C  = f₂ ( i_B , v_C ).

By using Taylor 's series expression, and neglecting the higher order terms we obtain.

Partial derivatives are taken keeping collector voltage or base current constant. The Δv_B, Δv_C, Δi_B, Δi_C represent the small signal base and collector current and voltage and can be represented as v_b, i_b, v_C, i_C.

The model for CE configuration is shown in the figure 2.

Figure 2

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