In common collector configuration of BJT, which of the following options is correct?

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  1. It has very high input impedance due to the presence of emitter resistance.
  2. It has a lower input impedance than a common-emitter amplifier.
  3. The input characteristics are a plot of input current (IB) vs. input voltage (VBE) for a constant IE.
  4. If the emitter resistance is bypassed with a capacitor, the input impedance increases.

Answer (Detailed Solution Below)

Option 1 : It has very high input impedance due to the presence of emitter resistance.
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Detailed Solution

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Explanation:

Common Collector Configuration of BJT

The common collector (CC) configuration, also known as an emitter follower, is a type of bipolar junction transistor (BJT) configuration where the collector terminal is common to both the input and the output circuits. In this configuration, the input is applied between the base and the collector, and the output is taken from the emitter and the collector.

Additional Information

  •  High input impedance due to the presence of emitter resistance, which makes it less sensitive to loading effects.
  • Low output impedance, making it suitable for driving low impedance loads.
  • Provides current gain, which can be useful in applications requiring high current drive capability.
  • Stable voltage gain of approximately one, which ensures that the output voltage closely follows the input voltage.
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