Principles of Transistor Circuits, 9th Edition

Appendix B

Transistor parameters

Introduction

There are three main systems of expressing the properties of a fourterminal network. In each the network is regarded as having an input voltage v_i, an input current i_i, an output voltage v_o and output current i_o as illustrated in Fig. B.1.

Fig. B.1

Z parameters

In the first system the input and output voltages are expressed in terms of the input and output currents thus:

$v_i=z_i{i}_i+z_r{i}_o$

  (B.1)

$v_o=z_f{i}_i+z_o{i}_o$

  (B.2) ...