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Doctors Medicines MCQs Q&A

  1. Very high frequency signals
  2. Audio frequency signals
  3. Very low frequency signals
  4. RF signals
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1 Answers

Option 3 : Very low frequency signals

Direct coupled amplifier:

 Some other types of amplifiers are as follows:

1.) RC coupled amplifier:

  •  The output of the first transistor is connected to the input of the second transistor through a capacitor CC which is called a coupling capacitor.
  • RC coupled amplifiers are used to amplify the RF signal and audio signals.
  • RC coupled amplifier is used as voltage amplifiers.
  • ​Its Q-factor is stable and has a smooth bandwidth.
  • It has very poor impedance matching characteristics.

​2.) Transformer coupled amplifier:

  • When the output of the amplifier stage is connected to the input of the next stage through a transformer, then it is called a transformer-coupled amplifier.
  • Transformer Coupling in amplifier is mainly used for impedance matching.
  • Transformer coupling is used in high-power audio amplifiers.
  • It provides a very high gain.
  • These amplifiers have poor frequency response, the gain decreases with an increase in frequency.
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