BJT Transistor Amplifier Configurations A bipolar junction transistor (BJT) can be connected in three basic ways in an amplifier circuit: Common Emitter (CE) Common Base (CB) Common Collector (CC) The word “common” refers to the transistor terminal that is common to both the input and output circuits, usually with respect to the AC signal. The three configurations use the same three transistor terminals—base, emitter, and collector—but produce very different electrical characteristics. 1. Common Emitter (CE) Basic Principle In the Common Emitter configuration, the emitter is common to both the input and output circuits. The input signal is applied between the base and emitter, while the output signal is taken between the collector and emitter. The emitter is normally connected to the signal reference (AC ground), either dir...
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