## Explain common base configuration, Electrical Engineering

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Q. Explain common base configuration?

Common-base transistor amplifiers are so-called because the input and output voltage points share the base lead of the transistor in common with each other, not considering any power supplies The most striking characteristic of this configuration is that the input signal source must carry the full emitter current of the transistor. Because the input current exceeds all other currents in the circuit, including the output current, the current gain of this amplifier is actually less than 1 (notice how Rload is connected to the collector, thus carrying slightly less current than the signal source). In other words, it attenuates current rather than amplifying it. In the common-base circuit, we follow basic transistor parameter: the ratio between collector current and emitter current, which is a fraction always less than 1. This fractional value for any transistor is called the alpha ratio, or I ratio.

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