![]() ![]() That is, compare the direction of IE to the polarity or V EE for each configuration and the direction of I C to the polarity of V CC. Note also that the applied biasing (voltage sources) are such as to establish a current in the direction indicated by each branch. are the actual directions as defined by the choice of conventional flow. ![]() The arrow in the graphic symbol defines the direction of emitter current (conventional flow) through the device.Ī ll the current directions appearing in Fig. Recall that the arrow in the diode symbol defined the direction of conduction for conventional current. In addition, the base is usually the terminal closest to, or at, ground potential.Throughout this book, all current directions will refer to conventional (hole) flow rather than electron flow.This choice was based primarily on the fact that the vast amount of literature available at educational and industrial institutions employs conventional flow and the arrows in all electronic symbols have a direction defined by this convention. The notation and symbols used in conjunction with the transistor in the majority of texts and manuals published today are indicated in the figure for the common base configuration with PNP and NPN transistors.The common-base terminology is derived from the fact that the base is common to both the input and output sides of the configuration. ![]()
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