A CE amplifier is also called ______ circuit

Question

Examoogle · Accepted Answer

Grounded emitter

Explanation: A Common Emitter (CE) amplifier is referred to as a grounded-emitter circuit because the emitter terminal is common to both the input and output signal paths and is connected directly to the reference ground. This configuration is widely used in electronic circuits because it provides both voltage and current gain, along with a phase reversal of 180 degrees between input and output.

Working Principle: In a CE configuration, the input signal is applied between the base and the emitter, while the output is taken from the collector with respect to the grounded emitter. Since the emitter is held at a fixed potential (ground), it acts as a common junction for the input and output loops, facilitating effective signal amplification through the transistor's transconductance property.

Key Formulas: $A_v = \frac{V_{out}}{V_{in}} \approx -g_m R_C$ — Voltage gain of CE amplifier; $I_C = \beta I_B$ — Collector current relation

Key Points: CE amplifier provides high voltage gain and high current gain.; The output signal is 180 degrees out of phase with the input signal.; The input impedance is moderate, while the output impedance is relatively high.; It is the most versatile and commonly used transistor amplifier configuration.

Advantages: High power gain; Reasonable input and output impedance balance

Disadvantages: Phase inversion; Gain is highly dependent on temperature and transistor parameters

Applications: Audio frequency amplifiers; RF tuning circuits; Voltage and current amplification stages

Additional Info: Common Collector (CC) is known as Emitter Follower.. Common Base (CB) is often used for high-frequency impedance matching.

Answer: A is correct — The Common Emitter (CE) amplifier is universally called a grounded-emitter circuit because the emitter terminal serves as the shared reference point for both the signal source and the load.

Exam Tip: Remember: CE (Common Emitter) has phase reversal, CC (Common Collector) has unity voltage gain, and CB (Common Base) has unity current gain.

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