Which of the following is a feature of a Darlington pair amplifier?

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RRB ALP CBT 2 Electronic Mechanic Previous Paper: Held on 23 Jan 2019 Shift 1
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  1. Voltage gain is nil 
  2. High input impedance and low voltage gain
  3. Low input impedance and low voltage gain 
  4. high input impedance and high voltage gain 

Answer (Detailed Solution Below)

Option 2 : High input impedance and low voltage gain
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Detailed Solution

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Darlington Pair:

  • Darlington pair is a special arrangement of two standard NPN or PNP bipolar junction transistors (BJT) connected together
  • The Emitter of one transistor is connected to the base of the other to produce a more sensitive transistor with a much larger current gain
  • It is useful in applications where current amplification or switching is required; The voltage gain is unity in this case.
  • The output stage of the Darlington pair is a common collector stage hence it is having low output impedance and also it is having high input impedance. 

The symbolic diagram of the Darlington pair is shown below

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