Why is emitter grounded in common emitter configuration?

So the Emitter is Common to both Input and Output. As it is most convenient to have a “High” and a “Ground” for both Inputs and Outputs, the Emitter is connected to the Ground of both Input and Output. This is why the transistor Emitter is connected to Ground.

Why does the common emitter configuration circuit is preferred over the common base configuration circuit?

Common emitter circuit is preferred over a common base circuit in amplifiers because the resistance of the common emitter circuit is much less than that of the common base circuit. Also the power gain in the common emitter circuit is much higher than that in a common base circuit.

What is the difference between common emitter and common base configuration?

Common Base Configuration – has Voltage Gain but no Current Gain. Common Emitter Configuration – has both Current and Voltage Gain. Common Collector Configuration – has Current Gain but no Voltage Gain.

What is meant by common base configuration?

In common base configuration, emitter is the input terminal, collector is the output terminal and base terminal is connected as a common terminal for both input and output. Thus the base terminal of a transistor is common for both input and output terminals and hence it is named as common base configuration.

Why do we use common base configuration?

Due to its input-output impedance characteristics, the common base amplifier arrangement is extremely useful in audio and radio frequency applications as a current buffer to match a low-impedance source to a high-impedance load or as a single stage amplifier as part of a cascoded or multi-stage configuration where one …

Why do we use common-base configuration?

What is the common base configuration of emitter and collector?

In common base configuration, emitter is the input terminal, collector is the output terminal and base terminal is connected as a common terminal for both input and output.

What is the difference between common base and common emitter amplifiers?

The common base amplifier uses a bypass capacitor – or a direct connection from base to ground to hold the base at ground for the signal only! The common emitter amplifier (except for intentional R E feedback) holds the emitter at signal ground, while the common collector circuit does the same for the collector.

What is common base configuration of a transistor?

Definition: The configuration in which the base of the transistor is common between emitter and collector circuit is called a common base configuration. The common base circuit arrangement for NPN and PNP transistor is shown in the figure below.

What is the current gain of the common base configuration?

When the emitter current flows into the base terminal and doesn’t perform as collector current. This current is always less than the emitter current which causes it. The gain of the common base configuration is always less than 1. The following formula is used to calculate the current gain of the CE (α) when the CB value is given i.e (β).