Question
Download Solution PDFThe collector current in a Class-C amplifier:
This question was previously asked in
KVS TGT WET (Work Experience Teacher) 23 Dec 2018 Official Paper
Answer (Detailed Solution Below)
Option 2 : flows for 120° or less of the ac input cycle
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KVS TGT Mathematics Mini Mock Test
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Detailed Solution
Download Solution PDFThe collector current of a class C amplifier is a half-sine wave.
- 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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