Lecture - 28: h-parameters

Example - 1

For the circuits shown in fig. 1. (CE–CC configuration) various h-parameters are given

h ie = 2K, hfe = 50, hre = 6 * 10 -4, h oc= 25 m A / V.

hic = 2K, hfe = -51, hre = 1, hoc = 25 m A / V.

Fig. 1

The small signal model of the transistor amplifier is shown in fig. 2.

Fig. 2

In the circuit, the collector resistance of first stage is shunted by the input impedence of last stage. Therefore the analysis is started with last stage. It is convenient; to first compute current gain, input impedence and voltage gain. Then output impedence is calculated starting from first stage and moving towards end.

The effective source resistance R'S2 for the second stage is R01 || RC1 . Thus RS2 = R'01 = 4.65K

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