h-Parameters

Small signal low frequency transistor Models:

All the transistor amplifiers are the two port networks having two voltages and two currents. Positive directions of the voltages and currents are shown in the figure 1.

Figure 1

Out of the four quantities of it two are independent and two are dependent. If input current i₁ and output voltage v₂  are taken independent then other two quantities i₂  and v₁  can be expressed in terms of i₁ and V₂.

The equations can be written as follows

here h₁₁, h₁₂, h₂₁ and h₂₂ are called as h-parameters.

= h_i = input impedance with output short circuit to AC.

=h_r  = fraction of the output voltage at the input with input open circuited or reverse voltage gain with the input open circuited to AC.

= h_f = negative of the current gain with output short circuited to AC.

The current entering load is negative of I₂. This is also called as forward short circuit current gain.

= h_o = output admittance with the input open circuited to AC.

If these parameters are specified for a particular configuration, then suffixes e, b or c are also included, for example h_fe, h_ib are h parameters of common emitter and common collector amplifiers

Using two equations generalized model of the amplifier can be drawn as shown in the figure 2.

Figure 2

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