C.2. Linear or Signal Model for the BJT
The primary function of a transistor in analog circuits is to produce a signal output current in response to a signal input voltage. In the case of the common-emitter circuits of Fig. C.1, the transistor input voltage is Vbe and the responding output current is the collector current Ic. (Variable subscript conventions are covered in Unit 2. Uppercase symbols with lowercase subscripts denote RMS or peak magnitude of periodic signals.) The linear relation between the two variables is the transconductance, gm. By definition, for the BJT
Equation C.7
In some simple amplifier circuits, this would be all ...
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