Simplified common emitter hybrid model:

In most of the practical cases it is suitable to obtain the approximate values of A V , A i etc rather than computing exact values. How circuit can be modified without reducing the accuracy greatly. Figure 1 shows CE amplifier equivalent circuit in the terms of h-parameters Since 1 / h_oe in parallel with the R_L  is equal to R_L  if 1 / h_oe  >> R_L approximately then hoe  can be neglected. Under these conditions

I_c = h_fe I_B .

h_re v_c = hre I_c R_L = h_re h_fe I_b R_L .

Figure 1

As h_fe.h_re  » 0.01, this voltage can be neglected in comparison with h_ic I_b drop across h _ie provided R_L is not large. If the load resistance R_L is small than hoe and hre can be neglected.

The output impedance seems to be infinite in anture. When V_s  = 0, and an external voltage is applied at output we find I_b = 0, I C = 0. True value depends upon the R_S and lies in between 40 K and 80K.

On the same lines, calculations for CC and CB can be done.

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