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Common Emitter & Common collector Transistor configuration, Analog Electronics Video Lecture | Crash Course for IIT JAM Physics

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FAQs on Common Emitter & Common collector Transistor configuration, Analog Electronics Video Lecture - Crash Course for IIT JAM Physics

1. What is the difference between common emitter and common collector transistor configurations?
Ans. In a common emitter transistor configuration, the input is applied to the base terminal, and the output is taken from the collector terminal. The emitter terminal is common to both input and output. On the other hand, in a common collector configuration, the input is applied to the base terminal, and the output is taken from the emitter terminal. The collector terminal is common to both input and output. The main difference lies in the voltage gain and phase relationship of the input and output signals.
2. How does the common emitter configuration provide voltage amplification?
Ans. The common emitter configuration provides voltage amplification by using the transistor's current gain. When a small input voltage is applied to the base-emitter junction, it controls the current flowing through the base-emitter junction, which, in turn, controls the collector current. Due to the transistor's current gain, the collector current is much larger than the base current. This current amplification leads to a voltage amplification at the output, as the collector current flows through a load resistor, creating a voltage across it.
3. What are the advantages of the common collector transistor configuration?
Ans. The common collector configuration has several advantages. Firstly, it provides a unity voltage gain, meaning the output voltage follows the input voltage closely. Secondly, it has a high input impedance, allowing it to interface with high impedance sources without loading them. Thirdly, it has a low output impedance, enabling it to drive low impedance loads effectively. Lastly, it provides a phase inversion between the input and output signals, which can be useful in certain applications.
4. How does the common collector configuration act as a buffer amplifier?
Ans. The common collector configuration acts as a buffer amplifier by isolating the input from the output. It has a high input impedance, which prevents the input source from being loaded and attenuated. At the same time, it has a low output impedance, allowing it to drive the load effectively. This isolation and impedance matching make it an ideal choice for buffering signals between different stages of a circuit, preventing signal degradation and maintaining signal integrity.
5. What are the disadvantages of the common emitter transistor configuration?
Ans. The common emitter configuration has a few disadvantages. Firstly, it has a voltage gain that is less than unity, meaning the output voltage is lower than the input voltage. This can be compensated by using additional amplification stages but adds complexity to the circuit. Secondly, it has a relatively high input impedance, which may cause it to load the preceding stage and affect overall circuit performance. Lastly, it provides a phase inversion between the input and output signals, which may not be desirable in certain applications.
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