Why do we prefer common emitter amplifier?

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 main advantage of CE amplifier over CB amplifier?

CE amplifier has a high input impedance and lower output impedance than CB amplifier. The voltage gain and power gain are also high in CE amplifier and hence this is mostly used in Audio amplifiers.

Why does a common emitter configuration of BJT is usually used as an amplifier?

⦁ CE is most widely used because it provides the voltage gain required for most of the day to day applications of preamp and power amps. It also provide the maximum transconductance or voltage gain for a given load.

Why the common emitter configuration is also known as an inverter?

Common emitter amplifier develops voltage output due to the current through the load resistor. That is, the output voltage decreases as the input signal increases. For this reason, the common-emitter amplifier configuration is referred to as an inverting amplifier.

What are the major advantages of CE configuration of a transistor over others?

⦁ The common emitter configuration has the highest power gain combined with medium voltage and current gain. The ability of this configuration to increase input signal power by 20dB (100 times) and more is widely used as signal amplifiers in communications.

Why the current gain of a common emitter amplifier is high?

Current gain in the common emitter circuit is obtained from the base and the collector circuit currents. Because a very small change in base current produces a large change in collector current, the current gain (β) is always greater than unity for the common-emitter circuit, a typical value is about 50.