h-Parameters

To determine the four h-parameters of transistor amplifier, input and output characteristic are used. The input characteristic depicts relationship in between input voltage and input current with output voltage as parameter. The output characteristic depicts relationship in between output voltage and output current with input current as parameter. Figure 1, shows output characteristics of CE amplifier.

Figure 1

The current increments are taken around quiescent point Q which corresponds to i_B = I_B and to collector voltage V_CE = V_C

The value of hoe at quiescent operating point can be given by the slope of output characteristic at the operating point (that is slope of tangent AB).

h_ie is slope of the suitable input on figure 2, at operating point (slope of the tangent EF at Q).

Figure 2

A vertical line on input characteristic represents the constant base current. The parameter can be obtained from the ratio (V_B2- V _B1 ) and (V_C2- V _C1 ) for at Q.

CE h-parameters of transistor 2N1573 are given below:

h_ie = 1000 ohm. h_re = 2.5 * 10 -4 h_fe = 50

h_oe = 25 m A / V

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