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 vi, an input current ii, an output voltage vo and output current io as illustrated in Fig. B.1.

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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:

vi=ziii+zrio

si1_e  (B.1)

vo=zfii+zoio

si2_e  (B.2) ...

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