The collector current in a Class-C amplifier:

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KVS TGT WET (Work Experience Teacher) 23 Dec 2018 Official Paper
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  1. is not rich in harmonics
  2. flows for 120° or less of the ac input cycle
  3. in sinusoidal
  4. flows for 240° or more of the ac input signal

Answer (Detailed Solution Below)

Option 2 : flows for 120° or less of the ac input cycle
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Detailed Solution

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The collector current of a class C amplifier is a half-sine wave.

F1 Shraddha Jaideep 29.10.2021 D6

  • Class C power amplifier is a type of amplifier where the active element (transistor) conduct for less than one-half cycle of the input signal.
  • Less than one-half cycle means the conduction angle is less than 180° and its typical value is 80° to 120°.
  • The reduced conduction angle improves the efficiency to a great extends but causes a lot of distortion.
  • The theoretical maximum efficiency of a Class C amplifier is around 90%.
  • In a Class C Amplifier efficiency and distortion, both are maximum.

Important Points

Class

Class-A

Class-B

Class-C

Class-AB

Operating cycle

360°

180°

Less than 180°

More than 180° and less than 360°

Position of Q

Centre

On X-axis

Below X-axis

Above X-axis

Efficiency

25% or 50%

78.5%

High (almost 100 %)

50 % to 78.5 %

Distortion

Absent

Present more than class-A

Highest

Present less than class A

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