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In reality: a is between 0.9 and 0.998 10.

8Īpproximations Emitter and collector currents: Base-emitter voltage: 9Īlpha () relates the DC currents IC and IE : Alpha () in the AC mode: Alpha (a)

Cutoff-The amplifier is basically off.

Active-Operating range of the amplifier.

6Ĭommon-Base Amplifier Output Characteristics This graph demonstrates the output current (IC) to an output voltage (VCB) for various levels of input current (IE). 5Ĭommon-Base Amplifier Input Characteristics This curve shows the relationship between of input current (IE) to input voltage (VBE) for various levels of output voltage (VCB).

The base-collector junction is reverse biased 3Ĭurrents in a Transistor Emitter current is the sum of the collector and base currents: The collector current is comprised of two currents: 4Ĭommon-Base Configuration The base is common to both input (emitter–base) and output (collector–base) of the transistor.

The emitter-base junction is forward biased.Transistor Operation With the external sources, VEE and VCC, connected as shown below: