In which type of power amplifier does the output current flow for the entire cycle of input signal?

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ALP CBT 2 Electrician Official Paper (Held On: 23 Jan 2019 Shift 3)
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  1. Class C
  2. Class AB
  3. Class B
  4. Class A

Answer (Detailed Solution Below)

Option 4 : Class A
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  • The transistor amplifier in which collector current flows for the entire cycle of input AC signal is called class A amplifier.
  • The transistor amplifier in which collector current flows for the half-cycle of an AC signal is called a class B amplifier.
  • The transistor amplifier in which collector current flows for less than half the cycle of an AC signal is called a class C amplifier

 

Power Amplifier

Conduction Angle

Maximum Efficiency

Figure of Merit

Class A

360°

50%

2

Class B

180°

78.5%

0.4

Class AB

180° - 360°

50 – 78.5%

0.4 – 2

Class C

< 180°

≥ 90°

< 0.25

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